pH, EC, PPM, TDS

1382 ppm (EC/TDS) calibration solution - 230 ml

$9^.95

Calibration Solution allows you to calibrate your meter in moments.

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1413 ppm (EC/TDS) calibration solution - 230 ml

$12^.95

Calibration Solution allows you to calibrate your meter in moments.

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1500 ppm (EC/TDS) calibration solution - 230 ml

$8^.50

Calibration Solution allows you to calibrate your meter in moments.

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Advanced Nutrients pH DOWN

$16^.56 - $46^.93

Advanced Nutrients pH balancing products are pure concentrates and have not been diluted.

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Advanced Nutrients pH UP

$16^.56 - $46^.93

Advanced Nutrients pH balancing products are pure concentrates and have not been diluted.

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Bluelab Carry Case

$19^.95

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.

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Bluelab Combo Meter

$249^.95

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

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Bluelab Conductivity Cleaning Kit

$19^.95

The level of conductivity is directly proportional to the amount of salts dissolved in water. The conductivity of your nutrient solution is a measurement of its strength, indicated by the actual amount of salts dissolved.

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Bluelab EC Solution - 250 ml

$6^.79

Bluelab 2.77EC Solution is used as a reference or checking solution to ensure the cleanliness and proper functionality of EC/CF probes.

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Bluelab Grower's Toolbox - Limited Edition

$169^.95

Save 15%

All of the essential tools you need to easily manage your crop by measuring the pH, conductivity (ppm) and temperature of the nutrient solution.

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Bluelab Guardian Monitor

$299^.95

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

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Bluelab pH Meter

$179^.95

Save 14%

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

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Bluelab pH Pen - ON SALE

$84^.95

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

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Bluelab pH Probe

$59^.95

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

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Bluelab pH Probe Clean Calibration Kit

$25^.50

Experienced growers suggest a pH level between 5.5 and 6.5 for most hydroponically grown plants. A dirty pH probe can skew the readings of your pH meter, resulting in a harmful growing environment.

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Bluelab pH Probe KCl Storage Solution - 100 ml

$9^.95

Save 16%

?Maximize the life and response time of Bluelab pH pens and pH probes with this KCI Storage Solution.

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Bluelab PPM Pen - ON SALE

$69^.95

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

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Bluelab Probe Care Kit - Conductivity

$9^.95

Save 16%

Everything you need to keep your pH probe clean and maintain accurate readings with the BlueLab Probe Care Kit!

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Bluelab Soil pH Meter

$219^.95

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

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Bluelab Soil pH Pen

$149^.95

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.

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Bluelab Soil pH Probe

$94^.50

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.

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Bluelab Truncheon - CF, PPM and EC meter

$119^.95

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

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Botanicare pH Adjusters

$10^.25

Highly concentrated pH adjusters that help hold the pH in your reservoir stable for a long period of time.

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Earth Juice Double Down

$9^.50 - $21^.95

Earth Juice Double Up and Double Down are potent pH adjusters that can be used in hydroponics systems or with soil based gardens.

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Earth Juice Double Down AND Up - 1 quart each

$17^.95

Earth Juice Double Up and Double Down are potent pH adjusters that can be used in hydroponics systems or with soil based gardens.

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Earth Juice Double Up - 1 quart

$9^.50

Earth Juice Double Up and Double Down are potent pH adjusters that can be used in hydroponics systems or with soil based gardens.

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Earth Juice Natural pH DOWN

$14^.31 - $49^.95

Proper pH levels are crucial for healthy plant growth. A pH that is too high or too low can reduce the availability of some nutrients causing plant stress.

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Earth Juice Natural pH UP - 2 lb

$16^.09

Proper pH levels are crucial for healthy plant growth. A pH that is too high or too low can reduce the availability of some nutrients causing plant stress.

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Earth Juice Natural pH UP and DOWN - 2 lb each

$28^.85

Proper pH levels are crucial for healthy plant growth. A pH that is too high or too low can reduce the availability of some nutrients causing plant stress.

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EC Dipstick

$74^.95

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

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EcoTestr pH 2

$72^.50

The EcoTestr™ pH 2 has an easy-to-read display and its ergonomically designed LC display allows you to read measurements in a glance.

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Electrode Cleaning Solution - 230 ml

$14^.35

You can double the life of your pH tester when using Electrode Cleaning Solution on a regular basis.

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Electrode Storage Solution - 230 ml

$9^.85

Use storage solution to greatly extend the life of your pH meter or tester probe. This step is important for ensuring that your equipment retains its accuracy.

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Espoma Organic Garden Lime - 6.75 lb

$3^.99

Save 12%

Espoma Organic Garden Lime is pellitized for easy application and is much safer than hydrated lime.

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Espoma Organic Soil Acidifier - 6 lb

$8^.50

Save 15%

Espoma organic Soil Acidifier is an effective way to lower soil pH to its optimal range for acid loving plants such as rhododendrons, azaleas and hydrangeas.

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General Hydroponic Dry pH DOWN

$11^.95 - $58^.50

We all know that the pH level in your hydroponics system is critical to optimum plant health.

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General Hydroponic Dry pH UP

$11^.95 - $58^.50

We all know that the pH level in your hydroponics system is critical to optimum plant health.

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General Hydroponics pH Test Kit

$6^.95

The General Hydroponics pH Test Kit measures the pH level of your hydroponics nutrient solution.

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GH Liquid Pro Ph DOWN

$11^.95 - $27^.95

We all know that the pH level in your hydroponics system is critical to optimum plant health. Most plants require pH levels between 5.5 and 6.8.

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GH Liquid Pro pH UP

$11^.95 - $27^.95

We all know that the pH level in your hydroponics system is critical to optimum plant health. Most plants require pH levels between 5.5 and 6.8.

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GH pH 4.0 AND pH 7.0

$14^.25 - $36^.75

General Hydroponics Calibration Solutions are specifically formulated for electronic pH meter calibrations and designed for hydroponic solution determinations.

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GH pH 4.01 Calibration Solution

$7^.50 - $19^.35

General Hydroponics Calibration Solutions are specifically formulated for electronic pH meter calibrations and designed for hydroponic solution determinations.

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GH pH 7.0 Calibration Solution

$7^.50 - $19^.35

General Hydroponics Calibration Solutions are specifically formulated for electronic pH meter calibrations and designed for hydroponic solution determinations.

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GH pH Control Kit

$14^.95

This pH Control Kit by General Hydroponics includes everything you need to check and maintain the proper pH levels for your indoor garden.

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GH pH Test Indicator Solution - 8 oz

$9^.95

Need a refill for your General Hydroponics pH testing kit?

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Hades Down

$22^.95 - $143^.95

Nectar for the Gods Hades Down is used to lower the pH level of nutrient solution.

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Hanna Calibration Solutions

$1^.15 - $26^.95

HANNA buffer solutions packets are perfect for single use calibration of your pH, EC TDS or Combo tester.

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Hanna Electrode Storage Solution - 500 mL

$15^.79

The electrode on a pH tester or monitor must be keep moist at all times to prevent damage to the tool.

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Hanna Instruments Champ pH Tester [HI-98106]

$46^.95

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.

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Hanna Instruments Checker 1 [HI 98103]

$36^.95

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!

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

$164^.95

Save 15%

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

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

$191^.95

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.

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

$99^.95

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

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Hanna Instruments HI 1285-6 Preamplified pH and EC Probe

$99^.95

Save 28%

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.

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Hanna Instruments HI 9813-6N Portable Meter

$219^.95

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.

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

$99^.95

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).

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HI 710007 Protective Rubber Boot

$29^.95

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.

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HI 73127 - Spare Electrode for Hanna Instruments Testers

$58^.95

Save 15%

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.

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Hydrion pH Test Paper Roll

$6^.25

Hydrion Insta-Chek pH Paper comes in a convenient plastic holder that contains a 15 foot roll of ph test paper, enough for about 1000 pH tests.

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Litmus / pH Paper Strips

$1^.99

Litmus paper strips are an easy-to-use alternative to check nutrient solution when you do not have a pH tester on hand.

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Martini EC59 EC TDS and Temperature meter

$97^.15

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

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Martini Mi56P Replaceable Electrode

$42^.50

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

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Martini pH55 Waterproof pH and Temperature meter

$67^.95

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

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Milwaukee MW100 pH Meter

$93^.95

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

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Milwaukee pH600 Tester

$29^.95

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

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

$199^.95

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)

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Milwaukee SE600 pH/EC/TDS Combination Probe

$81^.95

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

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Nutradip Trimeter

$219^.95

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

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Oakton Multiparameter PCS Testr 35

$164^.95

The waterproof Oakton Multiparameter PCS Testr 35 is a pocket-sized meter used for pH, TDS and temperature readings.

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Olympus Up

$12^.50 - $71^.95

Nectar for the Goods Olympus Up is a liquid lime pH booster that is also a terrific source of calcium for your garden.

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Rapitest Digital Soil pH Meter

$10^.95

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

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Rapitest pH Soil Tester

$4^.50

The Rapidest Soil pH Tester is designed to give accurate pH level results with relatively little effort.

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Rapitest Soil pH Meter with probe

$19^.95

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.

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

$69^.95

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

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Replacement pH Electrode [HI 1270]

$24^.95

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!

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Replacement pH Electrode [SE220]

$40^.95

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

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SaferGro pH Down - 1 pint

$7^.95

SaferGro pH Down is a great way to improve nutrient uptake by naturally lowering the pH of alkaline soils and hydroponic solutions.

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SaferGro pH Down - 1 quart

$10^.95

SaferGro pH Down is a great way to improve nutrient uptake by naturally lowering the pH of alkaline soils and hydroponic solutions.

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Sunleaves 1000 ppm (TDS) Calibration Solution - 3 oz

$7^.95

Calibration Solution allows you to calibrate your meter in moments.

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Sunleaves Digital 4-Way Soil Meter

$22^.95

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

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Sunleaves pH Electrode Storage Solution - 60 mL

$5^.95

Prevent damage to the electrode in your pH meter or tester during storage with a few drops of Sunleaves pH Electrode Storage Solution.

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Sunleaves pH Essential Digital Pen

$53^.95

Save 15%

Monitor the pH level in your garden quickly and accurately with the Sunleaves pH Essential Digital Pen. This pen is durable, water-resistant, and comes with everything you need to get started!

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Sunleaves pH Expert Plus Meter

$103^.95

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.

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Sunleaves pH Tester Kit

$6^.95

The Sunleaves pH Test Kit gives hydroponic gardeners a simple, foolproof method of getting fast, accurate pH readings.

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Sunleaves Soil pH Tester [SSPT500]

$7^.25

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

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Sunleaves Soil Sweetener - 20 lb

$11^.95

Sunleaves Soil Sweetener is made from pulverized dolomitic limestone, an all-natural amendment that dissolves sour, acidic buildup in soil.

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Sunleaves SPEP505 pH Probe

$43^.95

This is original equipment for the Sunleaves pH Expert Plus.

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Sunleaves STEP505 TDS Probe

$31^.95

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

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Sunleaves TDS Essential Digital Pen

$24^.95

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

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Sunleaves TDS Expert Plus Meter

$67^.95

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.

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