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pH, EC, PPM, TDS

Whether you indulge in indoor gardening, outdoor gardening or hydroponics growing, the proper balance of the growing environment determines the health of your plants... Here are some tools to help gain and maintain the proper balance your plant's environment.

  • pH: (chemistry) p(otential of) H(ydrogen)
  • TDS: total dissolved solids
  • PPM: parts per million
  • EC: electrical connectivity
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1382 ppm (EC/TDS) calibration solution - 230 ml
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
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
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 Perfect - Bloom
Advanced Nutrients - pH Perfect - Bloom
$9.95 - $69.95
Advanced pH Perfect bloom will give you the healthiest plants around. You will get the most of your money with this concentrated blend.
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Advanced Nutrients - pH Perfect - Micro
Advanced Nutrients - pH Perfect - Micro
$13.50 - $94.95
With chelates absorbed into your plants, you can expect nothing but high quality micro nutrients and an amazing garden. Advanced Nutrients pH Perfect Micro is the way to go!
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Advanced Nutrients pH DOWN
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
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
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
Bluelab Combo Meter
$249.95
The Bluelab Combo Meter is the lightweight, easy, and accurate way to test the conductivity, temperature, and pH levels.
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Bluelab EC Solution - 250 ml
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
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
Bluelab Guardian Monitor
$299.95
Closely monitor the pH, conductivity, and temperature around your grow room with the Bluelab Guardian Monitor. These are all important factors to plant growth.
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Bluelab pH 4 Solution
Bluelab pH 4 Solution
$1.69 - $6.99
Bluelab pH 4 Solution is specifically designed for calibration and allows you to ensure your Bluelab products are working effectively.
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Bluelab pH 7 Solution
Bluelab pH 7 Solution
$1.69 - $6.99
Using Bluelab pH 7 Solution ensures you pH testing devices are clean, calibrated, and ready to use.
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Bluelab pH Meter
Bluelab pH Meter
$179.95
Save 14%
Use the Bluelab pH Meter to easily test and read the pH level of your plants' nutrient solution.
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Bluelab pH Pen - ON SALE
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
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
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
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
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
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
Bluelab Soil pH Meter
$219.95
Bluelab Soil pH Meter is a reliable meter that is easy to use. Monitor the pH in your soil or hydroponics growing media to ensure it is perfect for the plants your are growing.
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Bluelab Soil pH Pen
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
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
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
Botanicare pH Adjusters
$10.25 - $23.95
Easily control the pH levels in your hydroponics reservoir with Botanicare pH Adjusters concentrated formula.
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Cyco PH DOWN
Cyco PH DOWN
$10.95 - $27.95
To get your maximum yield, you plants have to be able to absorb as many of the right nutrients as possible. Cyco pH Down is the product for you.
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Cyco PH UP
Cyco PH UP
$10.95 - $27.95
Specially formulated, derived from potassium hydroxide, and made with 36% soluble potash, CYCO pH Up helps you ensure optimal range of pH in your nutrient solutions by raising its total pH value.
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Earth Juice Double Down
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
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
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
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
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
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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EcoTestr pH 2
EcoTestr pH 2
$79.50
Save 15%
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
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
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
Espoma Organic Garden Lime - 6.75 lb
$3.95
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
Espoma Organic Soil Acidifier - 6 lb
$7.95
Save 16%
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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Nutradip Trimeter
Future Harvest 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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Trimeter Probe [TR 1505]
Future Harvest Trimeter Probe [TR 1505]
$62.95
This original equipment replacement probe fits the Nutradip tri-meter.
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General Hydroponics pH Test Kit
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
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
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
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
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
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
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
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
Hades Down
$16.95 - $143.95
Nectar for the Gods Hades Down is used to lower the pH level of nutrient solution.
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Hanna Calibration Solution
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
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]
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]
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]
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]
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]
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. Gauges 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
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
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]:
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
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
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
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
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
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
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
Martini pH55 Waterproof pH and Temperature meter
$69.95
Save 18%
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
Milwaukee MW100 pH Meter
$99.95
Save 16%
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
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]
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
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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Oakton Multi PT Testr 35
Oakton Multi PT Testr 35
$174.95
Save 15%
The waterproof Oakton Multi PT Testr 35 is a pocket-sized meter used for pH, TDS and temperature readings.
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Olympus Up
Olympus Up
$11.50 - $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
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
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
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]
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.
Add to Cart
Replacement pH Electrode [HI 1270]
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]
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
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
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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1000 ppm (TDS) calibration solution - 3 oz
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
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
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 Soil pH Tester [SSPT500]
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 STEP505 TDS Probe
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 Three-Way Meter [STWM500]
Sunleaves Three-Way Meter [STWM500]
$8.95
Conveniently test the moisture, light, and pH levels of your plants with the Sunleaves Three-Way Meter.
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Technaflora pH DOWN
Technaflora pH DOWN
$11.95 - $21.95
Technaflora pH UP and Technaflora pH DOWN help maintain optimum pH levels for your hydroponically grown plants.
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Technaflora pH UP
Technaflora pH UP
$11.95 - $21.95
Technaflora pH UP and Technaflora pH DOWN help maintain optimum pH levels for your hydroponically grown plants.
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