PH Tester, Control and Maintenance

Bluelab pH Controller

$513.95

Hands-free monitoring and dosing of solution pH levels. Simple.

We know pH levels can be the difference between a great crop and well, a disaster. Measuring and adjusting nutrient solution levels constantly can be time-consuming. And let’s face it; you have better things to do.

Our clever pH controller automatically monitors and fine-tunes the pH levels for you. You simply set it, and forget. The pH is taken care of. So you can relax…

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Autopilot pH Controller

$295.85

The Autopilot pH-1 controller accurately and reliably measures and controls the pH of any water-based solution, including hydroponic nutrient mixtures, and fish aquarium water. After selecting the desired pH setting from 5.0 to 8.0 pH, the pH controller measures the pH value of the solution and automatically adds pH adjustment (either acid or alkaline) to change the liquid's pH to the selected level. The pH controller includes a chemically resistant low voltage dosing pump, and both pH, and temperature sensors. Features include a digital display, adjustable dosing time, adjustable mixing time, adjustable pH dead band, maximum number of dosing cycles, pH high and low limits, and a data logger which shows the minimum and maximum pH recorded. Never before has there been a pH controller with these features for this value. Get automated, get Autopilot! Learn More

Bluelab Guardian Monitor

$258.65

In just one glance it measures all three critical parameters for successful growth pH, conductivity and temperature. Adjustable brightness display. Large easy to read, Plant Safe green LED displays. Selectable values for conductivity and temperature. Simple push button pH calibration system. No calibration required for conductivity and temperature. Silent alarm for both high and low settings. Settings retained when power lost (non-volatile memory). Temperature compensation. An international power supply. Water resistant design. Learn More

Hanna GroChek pH/EC/TDS/C Portable Meter

$209.85

HI 9813-6N is a versatile, water resistant multi-parameter portable meter specifically designed for agricultural applications such as hydroponics, greenhouses, farming and nurseries. It features an extra large LCD that clearly displays the parameter being measured as well as calibration instructions. Calibration is fast and easy with knobs located on the front panel of the instrument. HI 9813-6N is a pH/EC/TDS meter designed for simplicity of use in taking pH, mS/cm, ppm and temperature in the C scale measurements. Learn More

Bluelab Combo Meter

$201.75

Better crops start with the Bluelab Combo Meter, it's all you need for simple and reliable crop management and it's all within arms reach. It is a conductivity, pH and temperature meter all in one. It comes with a pH probe and conductivity/temperature probe, which are simply placed into the solution and the selected reading is displayed on screen. As the Bluelab Combo Meter is portable and does not require a power supply to operate, it can be used anytime and anywhere to help you manage your crops daily nutrient requirements. Calibration of the pH is very easy, using the push buttons on the meter and fresh Bluelab calibration solutions. Conductivity and temperature do not need to be calibrated as this is locked in during manufacture. The Bluelab Combo Meter gives you the added benefit of being able to select the display options for °C or °F and EC, CF or ppm 500. Learn More

Hanna pH/TDS/Temp Monitor Hi 981504-7

$194.00

Designed for continuous monitoring of pH, TDS and temperature, the HI 981504 is simple to install and can be placed above the sample to be tested. pH, TDS and temperature measurements are simultaneously displayed on three backlit LCDs which can be easily viewed at a distance - even in low light. This means no more switching between parameters. Learn More

Hanna Portable pH/EC/TDS/Temp HI9813-6

$192.85

pH electrodes are commonly designed to produce and output signal equal to 0 mV when immersed in a solution with pH 7. But a constant output value at pH 7 occurs as a result of certain adverse events, such as: A broken bulb in the pH electrode, A short circuit in the cable or connector, or Magnetic force leakage in the cable or connector (for example, in case of excessive humidity). Learn More

Bluelab Soil pH Meter

$178.65

If you need to measure the pH level of soil, media or substrates, then the Bluelab® Soil pH Meter is just what you need! Our meter can be used by everybody from the home enthusiast to commercial growers. 5 year Bluelab® Guarantee (6 month for probe). Learn More

Bluelab Grower's Toolbox - Limited Edition

$155.00

The Bluelab Grower’s Toolbox combines the essential tools you need to easily manage your crop by measuring the pH, conductivity (ppm) and temperature of the nutrient solution. Learn the hydroponics basics with the Grow Book, so you can get going… And keep growing with the ultimate handy team, the Bluelab pH Pen and Bluelab ppm Pen. These clever little pens make it easy to measure the nutrient uptake (pH), the amount of food available (ppm) and the solution temperature, so you can create the best nutrient environment for your plants’ growth. The Bluelab Probe Care Kit makes maintenance easy to maximize the life and accuracy of the pens probes. With these tools and essentials in one value added pack, The Grower’s Toolbox is a complete simple crop management system that helps you get it right, from the start. Learn More

Hanna Grochek Combo Monitor HI 991404

$154.85

The Combo HI 991404 meter is designed for continuous, high accuracy pH, EC/TDS and temperature measurements. These microprocessor indicators continuously monitor the three most important nutrient parameters in hydroponics, greenhouses and horticultural applications with a single instrument. These indicators feature a large, dual-level, backlit LCD to give you instantaneous readings of pH, EC or TDS and temperature, even from a distance. Learn More

Hanna Combo Waterproof pH/EC/TDS/Temp HI-98129

$144.85

The HI 98129 Combo waterproof tester offer high accuracy pH, EC/TDS and temperature measurements in a single tester! No more switching between meters for your routine measurements. The waterproof Combo (it even floats) has a large easy-to-read, dual-level LCD and automatic shut-off. pH and EC/TDS readings are automatically compensated for the effects of temperature (ATC). This technologically advanced tester has a replaceable pH electrode cartridge with an extendable cloth junction as well as an EC/TDS graphite electrode that resists contamination by salts and other substances. This gives these meters a greatly extended life. Your tester no longer needs to be thrown away when the pH sensor is exhausted. Learn More

Bluelab Soil pH Pen

$127.75

The Bluelab Soil pH Pen provides a pH and temperature reading of soils and media, so you know that the right nutrients will be made available to your plants. In soils or growing media, pH strongly influences the availability of the microorganisms to plants in the soil. Now you can closely monitor and adjust the pH levels right from the palm of your hand for optimum plant health and performance. Learn More

Hanna Waterproof PHEP 4 - HI 98127

$109.85

When HANNA® introduced its first version of the pHep (pH electronic paper) in 1986, it immediately revolutionized the standard in pH measurement. pHep's ease-of-use in combination with its affordability made it possible for non-technical and technical personnel alike to measure pH on the spot, accurately and inexpensively throughout a variety of industries. Since its introduction, over 1 million pHeps have gone to satisfied customers around the world. Learn More

Hanna Portable pH/EC/TDS/Temp HI9813-6 Replacement Probe

$104.85

Replacement Probe HI1285-6 for Hanna Portable pH/EC/TDS/Temp HI9813-6 Learn More

Hanna GroChek pH Temperature & Monitor HI 991401-01

$99.85

This indicator from HANNA has a large backlit LCD to give users instantaneous readings of both pH and temperature that can be easily read in dim light. The HI 991401-01 provides automatic calibration, automatic buffer selection and automatic temperature compensation. HI 991401-01's waterproof housing has been designed to meet the growers’ need for an indictor that is well suited to withstand the aggressive environments found in agricultural and hydroponics applications. Measurements are highly accurate and can be verified with one or two point calibrations. With a 12 VDC power supply included with the meter, low battery failures are never an issue. Learn More

Bluelab Commercial Truncheon

$99.75

With a conductivity range right up to 6.0EC (60CF or 4200ppm), it will never leave you short. The Commercial Truncheon® Nutrient Meter has been designed for hydroponic crops that require a higher than normal EC or CF requirement during their growing cycle. Its super tough, fully waterproof, has no on/off buttons to worry about and does not need calibrating. Learn More

Hanna DiST 5 Waterproof EC/TDS/Temperature HI98311

$99.15

The original DiST (Dissolved Solids Tester) was first introduced in 1986 by HANNA®. Since then, Conductivity and Total Dissolved Solids measurements have never been easier. DiST's ease-of-use, in combination with its affordability, made it the standard in EC and TDS measurement. HANNA® continues the tradition of innovation with the DiST 5. Learn More

Hanna GroChek pH Indicator w/ Electrode

$97.85

HI 981401N has been designed to meet the Grower's need for equipment suited to the aggressive environments found in agricultural and hydroponics applications. The housing is water-resistant and features a molded eye which allows installation right above the sample to be monitored. Measurements are highly accurate and can be verified with one or two point calibrations. With a 12 Volt DC power supply included with the meter, low battery failures are never an issue. The electrode is interchangeable and the connector is well-protected behind a waterproof sheathing. The meter is supplied with a stainless steel probe, preventing potential grounding problems and ensuring extended electrode life. Learn More

Bluelab Truncheon Original Meter EC & PPM

$97.75

With its super tough, high quality, fully waterproof design, no calibration required, daylight readable blue LED's and no on/off buttons to worry about, the Bluelab Truncheon® Nutrient Meter has proven itself as the world's favourite nutrient meter. It is powered by three standard AA batteries. Learn More

Hanna pH/EC/TDS Temp Continuous Monitor Replacement pH Probe

$89.50

Replacement pH Probe for Hanna pH/EC/TDS Continuous Monitor HI 991404 Learn More

Bluelab Soil pH Meter Replacement Probe

$84.00

Replacement probe for Bluelab Soil pH Meter Learn More

Bluelab pH Pen

$79.75

The Bluelab pH Pen is the latest innovation for hand held pH meters and is the ultimate handy solution for measuring pH. Hydroponic growing lets you give the best care possible to your plants. The quality of care is in your control. The Bluelab pH Pen provides a compact, quick and handy way to manage the success of your crops to ensure maximum uptake of nutrients. Teamed with our Bluelab EC Pen or Bluelab ppm Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health. The Bluelab pH Pen and conductivity pen range has been specially developed as an affordable and effective option for hobby or small scale growers. Learn More

Hanna Replacement Probe HI 73311

$69.45

Spare probe for HI 98311 Spare amperometric graphite probes for EC and TDS testers. Learn More

Bluelab PPM Pen

$68.75

The Bluelab conductivity pens are the latest innovation for hand held conductivity meters and the ultimate handy solution for measuring conductivity. Hydroponic growing lets you give the best care possible to your plants. The quality of care is in your control. The Bluelab Conductivity Pens measure how much food the plant has available. The Bluelab ppm pen provides a compact, quick and handy way to manage the success of your crops to ensure they have the nutrients they need. Teamed with Bluelab's pH Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health. The Bluelab pH Pen and conductivity Pen range has been specially developed as an affordable and effective option for hobby or small scale growers. Learn More

Hanna Waterproof PHEP 4 Replacement pH Probe

$60.25

Replacement pH Probe HI73127 for Hanna PHEP 4 Tester HI98127 Learn More

Hanna PHEP Tester HI 98107

$55.85

The HI 98107 (pHep®), which is the result of over two decades of research and manufacturing experience, is the updated version of our widely popular 96107 (pHep®). Today the redesigned pHep series feature a rugged and ergonomically enhanced casing that fits comfortably in your hand and a larger LCD which makes it easier to read at any angle. With the latest innovation of a non-clogging fiber junction the new pHep meters last much longer. Simply pull out 1-2 mm (1/8") of the junction fiber to completely renew the junction. Learn More

Bluelab Replacement pH Probe for Guardian, Combo & pH Meter

$51.95

Easy to clean because of its bullet shaped glass bulb. Fully waterproof and less fragile than all-glass electrodes because of its tough polypropylene barrel. Gel filled (non-refillable) making it maintenance free and a double junction reference providing longer life! Learn More

Control Wizard 24-7 Nutrient Monitor

Starting at: $49.75

The 24–7 Nutrient Monitor™ is a great all around meter for nutrient applications needing constant monitoring. It measures PPM, pH and Temperature. Both pH and PPM electrodes are placed into the solution needing monitoring. Its large illuminated green LCD display allows easy reading from a distance. This makes it so easy to keep a watch on nutrient tanks by simply walking by! Both pH and PPM are temperature compensated for accurate readings. The electrodes are replaceable at a relatively low price compared to other brands of meters found in its class. Learn More

HM Digital PH-200 Waterproof pH Meter

Starting at: $44.85

Measure pH and Temperature Auto-ranging three point calibration with digital fine tuning Includes 4 pH buffer solution in a sponge embedded in a clear cap Waterproof housing Simultaneous temperature display Measurement Range : 0-14 pH Digital automatic calibration (one point), with digital fine tuning Auto-off function, data-hold function and low-battery indicator Display: large and easy-to-read LCD screen includes simultaneous temperature reading Factory Calibrated: The PH-200 meter is three-point calibrated to 4, 7 and 10 pH. The meter can be recalibrated with digital calibration using the push button, rather than a screwdriver. Includes a cap, batteries, lanyard, and pH 7.0 buffer One Year Warranty. Learn More

HM Digital Aquapro TDS Water Tester AP-1

$43.85

Measures total dissolved solids (TDS) and temperature. Automatic Temperature Compensation (ATC) Water-resistant housing Measurement Range: 0-5000 ppm Digital Calibration (push button) Auto-off function, data-hold function and low-battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory Calibrated: The AquaPro is calibrated with a 342 ppm NaCl solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver. Includes a cap and batteries. One year warranty. Learn More

HM Digital Inline Dual TDS Monitor DM-1

$42.85

Displays TDS levels of the feed water and product water with in & out electrode probes. Highly efficient and accurate due to its advanced microprocessor technology. Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use. Dual Range 0-9990 ppm. Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be re-calibrated with a mini-screwdriver. Comes equipped with Mur-lok® Quick-Connect T-fittings. Installs quickly and easily. One year warranty. Learn More

Luster Leaf Rapitest Digital 3 Way Analyzer

$39.85

This digital 3-way soil analyzer will help you get the proper readings for pH, fertility and temperature. Gardener's, enjoy using meters as an easy and convenient method to check your soil for these readings and with just a couple touches to the digital analyzer you will have your information for optimal plant growth. This analyzer will help you see where fertility levels are at, it has a quick and easy to read fertility meter that reads the combined levels of nitrogen, phosphorus and potash to determine proper health, growth and productivity for your plants. This tester also has a test feature for soil temperature and pH levels. It takes the guess work out of it. Try it now and see how easy it is to get the information you need for maximum growth for your plants. Learn More

Luster Leaf Rapitest Electronic 4 Way Analyzer

$34.85

Instantly tells you the fertility of your soil Measures the light intensity in foot candles Instantly tells you when to water your plants by measuring their moisture levels Instantly tells you how acid or alkaline your soil is by measuring the pH level Measures four different levels for fertilizer, light, moisture and pH. Includes instructions and guides for all four measuring levels. Learn More

Hanna Primo TDS Tester

$34.75

The Primo TDS tester provides a fast and dependable way to measure the Total Dissolved Solids in your water samples. It is ideally suited for the rigorous demands of water quality professionals, who will appreciate the practicality of Primo's easy-to-read LCD when demonstrating the before and after results of conditioning and filtration systems. Temperature is compensated automatically to ensure the readings are consistent to the standard or reference temperature. Learn More

HM Digital COM-100 EC/TDS/Temp Meter

Starting at: $31.85

Measures electrical conductivity (EC), total dissolved solids (TDS) and temperature. Three different calibration options (KCl, 442TM, NaCl), each with its own non-linear conversion factor. Automatic Temperature Compensation (ATC) using three temperature coefficients. Waterproof housing. Measurement Range: 0-9990 µS; 0-8560 ppm (auto-ranging). Digital Calibration (push button). Auto-off function, data-hold function and low-battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory Calibrated: The COM-100 meter is calibrated with a 1413 µS solution. The meter can be recalibrate with digital calibration using the push buttons, rather than a screwdriver. Includes a cap, batteries and lanyard. Learn More

Advanced Nutrients pH Up

Starting at: $27.00

Acidity versus alkalinity are key factors in your crop's water and root zone, as measured by pH. If you have too high or too low pH, your crops cannot uptake nutrients, and may well be damaged or even killed. That's why smart growers daily monitor and adjust optimum pH levels for hydroponics, sphagnum moss, coco coir, rockwool, aeroponics, soil, and other types of plant growth media. Some companies make cheap, inferior pH adjustment products that never achieve consistent results; some of those products contain harmful materials. Advanced Nutrients pH products are carefully-manufactured pure concentrates that are pharmaceutical grade. Please note that this item must be shipped via FedEx Ground. This item cannot be sent to Alaska, Hawaii, Puerto Rico, Virgin Islands or Internationally. Learn More

Advanced Nutrients pH Down

Starting at: $27.00

Acidity versus alkalinity are key factors in your crop's water and root zone, as measured by pH. If you have too high or too low pH, your crops cannot uptake nutrients, and may well be damaged or even killed. That's why smart growers daily monitor and adjust optimum pH levels for hydroponics, sphagnum moss, coco coir, rockwool, aeroponics, soil, and other types of plant growth media. Some companies make cheap, inferior pH adjustment products that never achieve consistent results; some of those products contain harmful materials. Advanced Nutrients pH products are carefully-manufactured pure concentrates that are pharmaceutical grade. Please note that this item must be shipped via FedEx Ground. This item cannot be sent to Alaska, Hawaii, Puerto Rico, Virgin Islands or Internationally. Learn More

Bluelab Meter Carry Case

$25.50

Bluelab is excited to introduce a new accessory which makes transporting and using their Meters even easier! The Bluelab Carry Case provides a custom fit so you can use and read your Bluelab Meter right from the carry case. A firm outer casing offers impact reduction for your Meter. There are two pockets in the top of the case especially made for meter probes. The internal strap is a tidy way to tuck away the probe cables. Removable and adjustable straps provide even more comfort and convenience. The strap can be hung on the wall or used over your shoulder, keeping the Meter safe and dry in the carry case so only the probes go into the nutrient container. In-between use, we recommend placing dry probes into the pockets. Simply zip the Carry Case to close it, then tuck away safely for storage or transport. Learn More

Hanna Solution Starter Kit - pH & Cleaning

$23.75

Single-dose sachets are quick and easy to use. Each sealed, light tight sachets holds just the right amount of solution. Every time your instrument is calibrated using these HANNA sachets, it is using a newly-opened bottle of solution. This convenient starter kit includes the cleaning and calibration solutions that will give you the most out of your meter, saving you money on replacement probes. Learn More

Hanna Solution Starter Kit - pH & TDS

$23.75

Single-dose sachets are quick and easy to use. Each sealed, light tight sachets holds just the right amount of solution. Every time your instrument is calibrated using these HANNA sachets, it is using a newly-opened bottle of solution. This convenient starter kit includes the cleaning and calibration solutions that will give you the most out of your meter, saving you money on replacement probes. Learn More

Bluelab Probe Care Kit pH & Conductivity

$22.85

Everything you need to clean, hydrate and calibrate pH probes as well as clean and test conductivity (ppm/EC) probes. The instrument is only as accurate as the probe is clean. Accurate readings simplify crop management and provide improved growth. Probe cleaning and correctly storing pH probes ensures you get the most accurate readings possible and will maximize the life of a probe. The probe surface is where the instrument takes the reading of the solution or soil/media. If the probe face is dirty or contaminated, the readings may be inaccurate. Much like the windshield of a car, if it’s dirty you can’t see out! If the probe face is dirty, it cannot read the solution or soil accurately. Learn More

Hanna 1500 PPM Calibration Solution - 500 ml

$21.45

TDS solution are produced with high-quality potassium chloride in various concentrations. They are standardized using a conductivity meter calibrated with NIST potassium chloride. HANNA is one of the few producers to offer calibration solutions for lab and field applications with packages from 20 to 500 mL. Our packaging has been designed to keep air and light from damaging the calibration solutions. Learn More

General Hydroponics pH Control Kit

$21.45

Contains: 8 oz. pH UP 8 oz. pH DOWN 1 oz. indicator & vial Please note that this item must be shipped via FedEx Ground. This item cannot be sent to Alaska, Hawaii, Puerto Rico, Virgin Islands or Internationally. Learn More

Hanna pH 4.01, pH 7.01, 1500 PPM, 1413 uS Solutions

Starting at: $21.45

HANNA® buffer solutions are prepared according to precise formulas and are standardized with a pH meter calibrated according to the NIST standards. Learn More

General Hydroponics pH Up

Starting at: $20.00

This Base solution is formulated using Potassium Hydroxide and Potassium Carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level. This powder based formula is made to raise the pH in a reservoir. Lightweight in comparison to liquids. Please note that this item must be shipped via FedEx Ground. This item cannot be sent to Alaska, Hawaii, Puerto Rico, Virgin Islands or Internationally. Learn More

General Hydroponics pH Down

Starting at: $20.00

The Acid formulation uses food grade Phosphoric acid to lower the pH to the proper level. This powdered acid formula is easy to handle and ship. Lightweight in comparison to liquids. Widely recognized as a consistent and reliable product. Please note that this item must be shipped via FedEx Ground. This item cannot be sent to Alaska, Hawaii, Puerto Rico, Virgin Islands or Internationally. Learn More

General Hydroponics pH Test Indicator - 8 oz

$14.95

General Hydroponics pH Test Kits make pH testing easy.

Fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator, and observe the coloration of the liquid in the test vial. Many experienced growers prefer our pH Test Kit to expensive electronic meters because it is reliable and easy of use.

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Bluelab Probe Care Kit Conductivity

$14.75

Everything you need to clean and test conductivity (ppm/EC) / temperature probes. The instrument is only as accurate as the probe is clean. Accurate readings simplify crop management and provide improved growth. Proper ppm/EC probe maintenance also ensures you maximize the life of the probe and instrument. The probe surface is where the instrument takes the reading of the solution. If the probe face is dirty or contaminated, the readings may be inaccurate. Much like the windshield of a car, if it’s dirty you can’t see out! If the probe face is dirty, it cannot read the solution. Learn More

Bluelab pH 4.0, pH 7.0, EC 2.77 Solution

Starting at: $10.65

The Bluelab Calibration Solutions are a very necessary part of a growers toolbox. They are required for the calibration and checking of Bluelab meters and controllers. These solutions are manufactured specific to the calibration process and referenced to high class laboratory standards by Bluelab. Learn More

General Hydroponics pH 4.01, pH 7.01, 1500 PPM Solutions

Starting at: $9.85

General Hydroponics™ uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics™ technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used. Learn More

Luster Leaf Rapitest pH Soil Tester Capsule Kit Model 1612

$9.35

Kit includes: Color comparator 10 pH test capsules Complete instructions for adjusting soil pH and pH preferences list for over 450 plants for the home, yard and garden. All you do is put a sample of soil into the comparator, add powder capsule, add water, shake and watch the color develop. Then, note your results. Fast, easy and it only takes a few minutes. Learn More

General Hydroponics pH Test Kit

$7.99

General Hydroponics pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator, and observe the coloration of the liquid in the test vial. Many growers prefer our pH Test Kit to expensive electronic meters because of its reliability and ease of use. Learn More

Bluelab Calibration Solution Sachets pH 7.0, 4.0 & 2.77 EC

Starting at: $7.25

Bluelab's 2.77EC Conductivity Solution, pH 7.0 and pH 4.0 Calibration Solutions are now available in 20ml sachets. pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope). The 2.77EC Conductivity solution is used as a reference or checking solution to ensure you have adequately cleaned the EC/CF probe. Calibration Solutions should be stored in a cool place out of direct sun and heat. Please keep out of reach of children. They should be stored with the lids securely tightened. Learn More

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