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Sale Price: Starting at $12.95
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Concentrated base formula is used to raise the pH in a reservoir.
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Sale Price: Starting at $12.95
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This concentrated acid formula is used to lower the pH in a reservoir.
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Sale Price: Starting at $7.95
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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
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Sale Price: Starting at $7.95
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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
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Other Stores: $11.09
Sale Price: $7.99
Save: $3.10
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Technaflora’s pH Up and pH Down enable the gardener to moderate and maintain optimum pH levels. The pH scale is a measure that describes the relative acidity or alkalinity of a solution or medium. Both pH-balancing aids are manufactured using the highest-
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Other Stores: $11.09
Sale Price: $7.99
Save: $3.10
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Technaflora’s pH Up and pH Down enable the gardener to moderate and maintain optimum pH levels. The pH scale is a measure that describes the relative acidity or alkalinity of a solution or medium. Both pH-balancing aids are manufactured using the highest-
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Other Stores: $15.90
Sale Price: $12.75
Save: $3.15
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An enlightened concept in pH control, a crystallized pH adjuster for the professional & hobbyist. For soil, soilless, hydroponic, hydro-organic and foliar applications. For use with organic and synthetic fertilizers, herbicides and pesticides.
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Other Stores: $17.78
Sale Price: $14.25
Save: $3.53
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An enlightened concept in pH control, a crystallized pH adjuster for the professional & hobbyist. For soil, soilless, hydroponic, hydro-organic and foliar applications. For use with organic and synthetic fertilizers, herbicides and pesticides.
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Other Stores: $22.95
Sale Price: $17.47
Save: $5.48
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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
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Other Stores: $20.00
Sale Price: $18.99
Save: $1.01
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Works with all BRANDS! Used to clean meter tip. Works for both pH and conductivity meters. Comes as a two part A and B cleaning solution to remove both organic and inorganic deposits from meter sensors. Use monthly or as needed to refresh your meter
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Other Stores: $33.00
Sale Price: $23.99
Save: $9.01
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User friendly Tri-Packs contain everything you need to properly calibrate or maintain your meters.
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Other Stores: $64.95
Sale Price: $48.99
Save: $15.96
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Control Wizard Products is now introducing its Accurate pH and moisture meter for soil growers. The Accurate pH 8 has a 12" probe. Until now, soil growers with the need to keep careful tabs on the pH of their soil has had to rely on either cheap, poor qua
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Other Stores: $55.95
Sale Price: $49.95
Save: $6.00
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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
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Other Stores: $74.95
Sale Price: $56.99
Save: $17.96
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Control Wizard Products is now introducing its Accurate pH and moisture meter for soil growers. The Accurate pH 8 has a 12" probe. Until now, soil growers with the need to keep careful tabs on the pH of their soil has had to rely on either cheap, poor qua
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Other Stores: $73.95
Sale Price: $64.95
Save: $9.00
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Waterproof pH tester with 2 point manual calibration, 0.1 pH accuracy, range: 0.0 to 14.0 pH, replaceable MA73600 pH electrode with battery technology providing 1500 hours of battery life.
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Other Stores: $77.95
Sale Price: $66.95
Save: $11.00
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Model T75 Waterproof TDS tester with automatic temperature compensation and 1 point manual calibration range: 0.0 to 1999 ppm (mg/L), replaceable MA73075 probe.
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Other Stores: $109.95
Sale Price: $85.95
Save: $24.00
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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 pers
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Other Stores: $111.95
Sale Price: $89.50
Save: $22.45
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These state-of-the-art meters have been engineered with a host of features suited to the aggressive environments commonly found in agricultural applications; housings and cable connections have been sealed against vapor and humidity. With a 12 volt DC pow
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Other Stores: $99.95
Sale Price: $89.95
Save: $10.00
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The Nutradip CMS (constant monitoring system) Nutrient Meter has automatic temperature compensation and measures the TDS ppm/EC in your water. 2 year limited warranty on meter. 6 month limited warranty on the probe.
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Other Stores: $111.95
Sale Price: $89.95
Save: $22.00
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Hanna Instrument's innovative pH indicator 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 the molded eye all
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Other Stores: $109.95
Sale Price: $94.95
Save: $15.00
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Model SM100 pH meter, range: 0.0 to 14.0, with 2point manual calibration, and accuracy of 0.2 pH. Supplied with aMA911B/1 double junction pH electrode, 9v battery, 20ml pH 7.01 packet buffer solution and screwdriver for calibration.
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Other Stores: $123.95
Sale Price: $94.95
Save: $29.00
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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
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Other Stores: $116.95
Sale Price: $99.95
Save: $17.00
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Model SMS110 pH monitor, range: 0.0 to 14.0 pH, with2 point manual calibration, and accuracy of 0.2 pH. Set point range:3.5 to 7.5 pH, and led visual alarm active when reading is higher than set point. Supplied with 12v DC power adapter, MA911B/2 d
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Other Stores: $117.49
Sale Price: $99.95
Save: $17.54
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DS monitor, range: 0-1990 ppm with accuracy of 2% full scale and with 1 point manual calibration and automatic temperature compensation. Set point range 700 to 1800 ppm, and led visual alarm active when reading is lower than set point. Supplied with 12v D
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Other Stores: $135.00
Sale Price: $109.95
Save: $25.05
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The Bluelab Commercial Truncheon Nutrient Meter measures the strength of a nutrient solution, just like the Bluelab Truncheon Nutrient Meter. The Commercial Truncheon Nutrient Meter however, has been designed for hydroponic crops that require a higher tha
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Other Stores: $132.95
Sale Price: $114.95
Save: $18.00
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The Nutradip CMS (constant monitoring system) pH Meter is the reliable way to measure the acidity or alkalinity in your water. It is a continuous monitoring pH meter with automatic temperature compensation. 2 year limited warranty on meter. 6 month l
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Other Stores: $191.95
Sale Price: $159.95
Save: $32.00
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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
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Other Stores: $208.95
Sale Price: $169.95
Save: $39.00
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The 24-7 Nutrient Meter from Control Wizard Products is a great all around meter for nutrient applications needing constant monitoring. It measures PPM, pH and Temperature and with its large illuminated display it is easy to read from a distance. Cal
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Other Stores: $232.95
Sale Price: $199.95
Save: $33.00
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This meter gives you the ability to monitor pH level, Nutrient Levels in PPM and Nutrient Temperature. This continuous monitoring system requires no batteries, just plug it in to an AC wall receptacle and the meter will remain in a calibration mode f
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Other Stores: $229.95
Sale Price: $199.95
Save: $30.00
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Model SM802 Smart pH/EC/TDS combination meter, range: 0.00 to 14.00 pH, 0 - 4000 ppm, 0.00 - 6.00 mS/cm, accuracy of 0.20 pH and 2% full scale for EC and TDS. Supplied with a MA850 combination electrode, 9v battery, 20ml packet buffer solution of pH
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Other Stores: $244.95
Sale Price: $199.99
Save: $44.96
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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
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