Meters and Testers

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Whether using soil or hydroponics for your gardening, the proper balance of your growing environment can be the life or death of your plants. This area helps with the proper maintenance of:

pH: (chemistry) p(otential of) H(ydrogen)
TDS: total dissolved solids
PPM: parts per million
EC: electrical connectivity

Look through our selection of meter maintenance solutions. Find pH adjusters here.

Growco is a trained and certified Bluelab retail and warranty outlet.

We are HAZMAT approved to safely ship all of your PH control needs. We take great care in insuring that your packages will get to you in perfect condition, without leaking or being damaged in any way.

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Sort by manufacturer: Bluelab, Future Harvest, Generic, Hanna Instruments, Milwaukee, Oakton, Rapitest, Sunleaves

Bluelab Carry Case

The Bluelab Carry Case provides a custom fit so you can use and read your Bluelab Meter right from the carrying case. Simply zip it closed and your meter is protected during storage or transport.
$19.95

Bluelab Combo Meter

The Bluelab Combo Meter tests conductivity (nutrient), pH levels, and temperature, all in one convenient lightweight unit.
$249.95

Bluelab Guardian Monitor

The Bluelab Guardian Monitor measures all three critical parameters to successful plant growth - pH, conductivity and temperature.
$299.95

Bluelab pH Meter

The Bluelab pH Meter is used to accurately measure the pH value of nutrient solution.
$179.95

Bluelab pH Pen - ON SALE

The Bluelab pH Pen has been specially developed as an affordable, effective tool for hobby or small scale growers.
$84.95

Bluelab pH Probe

The Bluelab pH Probe is used to measure the pH of a solution.
$59.95

Bluelab PPM Pen - ON SALE

The Bluelab ppm Pen measures conductivity and temperature to ensure your plants are receiving the proper amounts of nutrients.
$69.95

Bluelab Probe Care Kit - Conductivity

The Bluelab Probe Care Kit allows you to ensure your probe is clean and contaminate free for the most accurate readings possible.
$9.95

Bluelab Soil pH Meter

The Bluelab Soil pH Meter is a reliable pH meter that provides accurate readings of soil or hydroponics growing media.
$219.95

Bluelab Soil pH Pen

The Bluelab Soil pH Pen provides both pH and temperature readings of soil and grow media, an effective tool for hobby or small scale gardeners.
$149.95

Bluelab Soil pH Probe

The Bluelab Soil pH Probe serves as original equipment replacement for the Bluelab Soil pH Meter, but can also be attached to the Bluelab Combo Meter.
$94.50

Bluelab Truncheon - CF, PPM and EC meter

The Bluelab Truncheon Meter is the best selling hydroponics CF / EC Meter in the world. The Truncheon meter measures EC, CF and PPM scales.
$119.95

EC Dipstick

The EC Dipstick is one of the easiest meters to use, providing the 4 most popular scales: EC, CF, 500:1ppm, and 700:1ppm!
$74.95

EcoTestr pH 2

The EcoTestrâ„¢ pH 2 has an easy-to-read display and its ergonomically designed LC display allows you to read measurements in a glance.
$79.50

Future Harvest Nutradip Trimeter

When you need continuous reservoir readouts of pH, TDS and temperature, the Nutradip Trimeter is your solution.
$219.95

Future Harvest Trimeter Probe [TR 1505]

This original equipment replacement probe fits the Nutradip tri-meter.
$62.95

Hanna Instruments Champ pH Tester [HI-98106]

Model HI 98106: The Hanna Instruments Champ pH Tester is an affordable, easy-to-use pH pen that is ready-to-use right out of the box.
$46.95

Hanna Instruments Checker 1 [HI 98103]

Model HI 98103: At the cost of just a few rolls of litmus paper, you can have the industry's best pocket-sized pH tester, made by Hanna Instruments!
$36.95

Hanna Instruments Combo pH, EC/TDS/Temp [HI 991404]

Model HI 991404: A large backlit LCD continuously monitors the three most important nutrient parameters in greenhouse, hydroponics and horticultural applications.
$164.95

Hanna Instruments Combo pH/EC/TDS/Temp tester [HI 98129]

Model HI 98129: pH/EC/TDS/Temperature tester by Hanna Instruments has a completely waterproof shell that also floats. It offers high accuracy readings with dual-level LCD readout.
$191.95

Hanna Instruments DIST 5 EC/TDS/Temp tester [HI 98311]

Model HI 98311: Hanna Instruments DIST 5 EC/TDS/temperature tester is waterproof. It even floats. Gauges temperature from 0.0 to 60.0 °C or 32.0 to 140.0 °F.
$99.95

Hanna Instruments HI 1285-6 Preamplified pH and EC Probe

Model HI 1285-6 preamplified pH and EC Probe with CAL CHECK is the replacement probe for the Hanna Instruments HI 9813-6N Portable Meter.
$99.95

Hanna Instruments HI 9813-6N Portable Meter

The Hanna Instruments HI 9813-6N pH/EC/TDS/°C Portable Meter is specifically designed for agricultural applications such as hydroponics, greenhouses, farming and nurseries.
$219.95

Hanna Instruments pHep5 waterproof pH/temp tester [HI 98128]:

Model HI 98128 (pHep 5): This Hanna Instruments waterproof tester features a dual-level LCD that gauges pH level -2.00 to 16.0, and temperature from 23.0 to 140.0 °F (-5.0 to 60.0 °C).
$99.95

HI 710007 Protective Rubber Boot

The Hanna Instruments HI 710007 Shockproof Rubber Boot is designed to be used with the HI 9813-6(N) portable pH/EC/TDS/temperature meter.
$29.95

HI 73127 - Spare Electrode for Hanna Instruments Testers

The Hanna Instruments Combo pH/ES/TDS/Temp Tester Spare Electrode can be replaced to renew function and accuracy for your Hanna Instruments Brand Tester.
$58.95

Martini EC59 EC TDS and Temperature meter

The Milwaukee Instruments Martini EC59 multi pocket tester measures and displays EC TDS and Temperature simultaneously on an easy to ready display.
$97.15

Martini Mi56P Replaceable Electrode

The Mi56P replaceable electrode is used with Martini pH55 and pH56 pH / temperature meters.
$42.50

Martini pH55 Waterproof pH and Temperature meter

The Milwaukee Instruments Martini pH55 Waterproof pH & Temperature tester has a large display with graphic symbols to help guide you through all operations.
$69.95

Milwaukee MW100 pH Meter

The Milwaukee MW100 portable pH meter replaces the model SM100 and is a no-frills low-cost tool that is ideal for beginners.
$99.95

Milwaukee pH600 Tester

The Milwaukee pH600 Tester is an easy-to-use, economical instrument that measures quick and reliable pH values.
$29.95

Milwaukee Portable 3-in-1 pH/EC/TDC meter [MW802]

The Milwaukee MW802 portable 3-in-1 meter allows you to measure pH, EC (conductivity) and TDS with just one instrument using a single probe. (replaces model SM802)
$199.95

Milwaukee SE600 pH/EC/TDS Combination Probe

The Milwaukee SE600 pH/EC/TDS combination probe is the replacement for both MW801 and MW802 models of combo meters.
$81.95

Oakton Multi PT Testr 35

The waterproof Oakton Multi PT Testr 35 is a pocket-sized meter used for pH, TDS and temperature readings.
$174.95

Rapitest Digital Soil pH Meter

The Rapitest Digital Soil pH Meter is an easy-to-use soil pH tester that determines soil acidity and alkalinity.
$10.95

Rapitest Soil pH Meter with probe

Ideal for testing soil pH levels of your indoor potted plants or outdoor garden areas. The Rapitest Soil pH Meter measures pH levels from 3.9 to 9.0.
$19.95

Replacement pH Electrode with BNC comm. & 2 m cable [HI 1293]

Model HI 991404: A large backlit LCD continuously monitors the three most important nutrient parameters in greenhouse, hydroponics and horticultural applications.
$69.95

Replacement pH Electrode [HI 1270]

Model HI 98103: At the cost of just a few rolls of litmus paper, you can have the industry's best pocket-sized pH tester, made by Hanna Instruments!
$24.95

Replacement pH Electrode [SE220]

This is the original equipment from Milwaukee that replaces the pH electrode on model MW100, MW101 and MW102 pH water testers.
$40.95

Sunleaves Digital 4-Way Soil Meter

The Sunleaves Digital 4-Way Soil Meter is a great tool for outdoor gardeners or indoor gardeners growing plants potted in soil.
$22.95

Sunleaves pH Essential Digital Pen

Sunleaves pH Essential Digital Pen allows you to the best readings possible of your garden's pH levels. Be sure your plants have the optimal pH levels they require to grow fast and strong.
$53.95

Sunleaves pH Expert Plus Meter

With the Sunleaves pH Expert Plus, measuring the pH in your reservoir is a snap! This handheld waterproof pH meter automatically compensates for the temperature of your nutrient solution to give you an extremely accurate reading.
$103.95

Sunleaves Soil pH Tester [SSPT500]

Monitor soil pH on a scale of 4 to 8 with the durable, easy-to-read Sunleaves Soil pH Tester.
$7.25

Sunleaves SPEP505 pH Probe

This is original equipment for the Sunleaves pH Expert Plus.
$43.95

Sunleaves STEP505 TDS Probe

The STEP505 replacement probe is the same high-quality component that ships with the Sunleaves TDS Expert Plus.
$31.95

Sunleaves TDS Essential Digital Pen

Measures nutrients levels from 0-9990 ppm with accuracy to ± 0.2%.
$24.95

Sunleaves TDS Expert Plus Meter

The Sunleaves TDS Expert Plus is a highly-advanced handheld meter that measures nutrient solution electrical conductivity (EC), total dissolved solids (TDS), and liquid temperatures.
$67.95

Sunleaves Three-Way Meter [STWM500]

Conveniently test the moisture, light, and pH levels of your plants with the Sunleaves Three-Way Meter.
$8.95
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