PH/EC/TDS Meters and Solutions

The acid formulation uses phosphoric acid to lower the pH to the proper level.

The acid formulation uses phosphoric acid to lower the pH to the proper level.

The acid formulation uses phosphoric acid to lower the pH to the proper level.

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 experienced growers prefer our pH Test Kit to expensive electronic meters because of its reliability and ease of use, which are important factors when the health of a valuable crop is at stake. Use 3 drops per 5ml of solution.

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 experienced growers prefer our pH Test Kit to expensive electronic meters because of its reliability and ease of use, which are important factors when the health of a valuable crop is at stake. Use 3 drops per 5ml of solution.

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 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 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.

Apera EC calibration kit (2.77EC, 8oz.)

Apera GroStar GS1 pH Pen

Apera GroStar GS1-E replacement pH electrode

Apera GroStar GS2 Soil pH Pen

Apera GroStar GS2-E replacement Soil Spear pH electrode

Apera GroStar GS3 EC Pen

Apera GroStar GS3-E replacement EC electrode

Apera GroStar GS4 pH/EC Combo Pen

Apera GroStar GS4-E replacement pH/EC combo electrode

Apera pH calibration kit (pH4/7, 8oz. each)

Apera pH calibration kit (pH 4/7/10, 8oz. each)

Apera pH probe maintenance kit

Replacement pH Sensor HM-500

1000ppm Calibration Solution

AquaPro TDS/Temperature Meter

Waterproof EC/TDS/Temp Combo Meter

EC/TDS/Temp Waterproof Hydro Tester

Ideal for commercial use. Includes a carrying case with belt clip. Highly efficient and accurate due to its advanced microprocessor technology. Hold function: saves measurements for convenient reading and recording. Auto-off function: the meter shuts off automatically after 10 min of non-use to conserve batteries. Measurement range: 0–9990 ppm. Display: large and easy-to-read LCD screen with built-in digital thermometer. Factory calibrated: Our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. 1 year warranty.

HydroMaster 100 - Continuous pH/EC/TDS/Temp Monitor

Continuous pH/EC/TDS/Temp portable/wallmount/bench

Replacement TDS Sensor HM-500

The COM-300 is an advanced waterproof combo meter with superior accuracy. The meter measures four parameters: pH, electrical conductivity (EC), total dissolved solids (TDS) and temperature. Features include 2 different conductivity conversion factors to convert EC to TDS using the 0.5 (NaCl) or 0.7 (442TM), as well as selectable modes for measurements in the µS, mS and ppm scales. The meter incorporates automatic temperature compensation (ATC) to accommodate for discrepancies in temperature that would naturally occur and also features digital calibration for easy and precise calibration that will yield better results.

Resolution: pH 0.1 pH, 0.00–14.0 pH. Accurate to +/-0.1 pH. Hold button and auto shut-off. Automatic calibration: Auto-ranging to 4, 7 or 10 pH. Very reliable and long lasting. Low battery indicator. Clear cap to notice moisture (or lack of) on probe. Glass encased reference electrode helps retain moisture. Batteries included.

Waterproof pH/Temperature Meter

PH/Temperature Meter

PH/ORP Storage Solution

Measures pH and temperature. Auto-ranging three point calibration with digital fine tuning. pH buffer 4 solution is in a sponge embedded in a clear cap. Measurement range: 0–14 pH with a waterproof housing. Digital automatic calibration (one point), with digital fine tuning. Auto-off, data-hold functions and low battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory calibrated with three-point calibration to 4, 7 and 10 pH. The meter can be recalibrated with digital calibration using the push buttons, no screwdriver needed. Includes a cap, batteries, lanyard and pH 7.0 buffer.

Replacement Platinum Sensor COM-100

TDS-3 Handheld TDS meter

The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics, gardening, pools, spas, aquariums, reef tanks, water ionizers, drinking water and more. Measures electrical conductivity (EC), total dissolved solids (TDS). Excellent for nutrient testing. Four scales: EC: µS, mS; TDS: ppm, ppt. This tester has automatic temperature compensation (ATC) and is water-resistant. Measurement range: 0–9990 µS; 0–5000 ppm; 0–9.9 mS; 0–5.0 ppt. Digital calibration (push button) to any point within the meter's range. Auto-off function, data-hold function and low battery indicator with large and...

Measures pH and temperature. Auto-ranging three point calibration with digital fine tuning. pH buffer 4 solution is in a sponge embedded in a clear cap. Measurement range: 0–14 pH with a waterproof housing. Digital automatic calibration (one point), with digital fine tuning. Auto-off, data-hold functions and low battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory calibrated with three-point calibration to 4, 7 and 10 pH. The meter can be recalibrated with digital calibration using the push buttons, no screwdriver needed. Includes a cap, batteries, lanyard and pH 7.0 buffer.

Digital Moisture Meter

Digital pH Meter

Mad Farmer PH Test Kit

pH Down 32oz

pH Up 32oz

Milwaukee Instruments EC40 EC/TDS Nutrient Meter

Digital Brix Refractometer Range - 0 to 85

PH4 Solution, 220ml

PH Tester w/1 Point Manual Cal