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pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope).Calibration Solutions should be stored in a cool place out
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Bluelab pH 4.0 Calibration Solution 250 ml (6/Cs)
$6.99
Milwaukee's most affordable pH tester, range: 0.0 to 14.0 pH, with one point manual calibration, and accuracy of ±0.2 pH. Battery Life: 700 hours. Calibration solution sold separately.
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Milwaukee pH Meter pH600 AQ
$25.99
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 c
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HM Digital pH / TDS / EC / Temp meter
$124.99
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 are
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GH pH 7.01 Calibration Solution Quart (12/Cs)
$14.99
The GrowBoss Nutrient probe does double duty. This probe measures TDS while auto sensing temperature when immersed in your nutrient solution, sending this data to the GrowBoss indicator. The GrowBoss Nutrient/Temperature probe has a 6 foot cord and connec
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Nutradip Grow Boss TDS Replacement Probe
$48.99
Our new pH Up and pH Down solutions can be used undiluted with the Bluelab pH Controller and Bluelab pH Controller Connect. They're manufactured with premium quality acid/alkali concentration.
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Bluelab pH Up 1 Gallon
$39.99
The Bluelab Guardian Monitor Connect Inline is not only a constant indicator of the desired levels of pH, conductivity and temperature of your nutrient solution, it also data logs these critical parameters to your computer for you. It does not stop there.
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Bluelab Inline pH Probe (Replacement Probe Guardian Monitor Connect In-Line)
$137.99
It’s time to get down! Gringo Rasta® pH Down uses citric acid to lower the pH of your nutrient solution in both soil and hydroponic environments.
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FoxFarm Gringo Rasta pH Down Pint (12/Cs)
$7.99
Keep your nutrient solution in the sweet spot with Emerald Harvest® pH Down. A pH reading above 6.5 is considered too alkaline for most hydroponic gardens. This premium pH acidifier allows you to reduce the pH of your nutrient solution. Use pH Down as nee
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Emerald Harvest pH Down Quart/0.95 Liter (12/Cs)
$13.99
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
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HM Digital Water Resistant Ec/TDS Meter w/ Temperature in C/F Hydrotester (Model COM-80)
$27.99
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 are
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GH pH 7.01 Calibration Solution 8 oz (12/Cs)
$5.99
Measures pH and temperature. Selectable units for °C & °F. Backlit LCD display. Double junction probe (not replaceable). Successful calibration indicator. Hold reading function and low battery warning. Fully waterproof with auto off function. Automatic te
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Bluelab pH Pen
$87.99
Professional pH controller especially designed for use with hydroponic systems and aquariums. Range: 0.0 to 14.0, 2 point manual calibration and Accuracy: ±0.2 pH. Set Point Range: 5.5 to 9.5 pH, LED visual alarm active & power plug socket for dosing turn
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Milwaukee pH Controller
$163.99
The HM-200 is a portable handheld meter that monitors 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
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HM Digital Hydromaster Portable
$215.99
The SCM-1000 is a portable digital Brix refractometer that measures the sugar content of a fluid. The sugar content is defined as a percentage of the weighted sugar in comparison to the weight of the total fluid that the sugar is dissolved in. It is fast
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HM Digital Brix Refractometer (10/Cs)
$260.99
Convenient ready to use liquids, concentrated, fast acting, high purity food grade ingredients. Use pH Up to raise pH of nutrient solution with potassium hydroxide.
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Grow More pH Up 30% Gallon (4/Cs)
$16.99
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 are
Add to cart
GH 1500 PPM Reference Solution 8 oz (12/Cs)
$5.99
pH adjusting crystals that will, once and for all, eliminate the hassles and worries of spilling, splashing and dealing with harsh liquid pH adjusters. Use to adjust the pH of fertilizer and plant micronutrient foliar solutions.
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Earth Juice Natural Up 2 lb (12/Cs)
$17.99
pH adjusting crystals that will, once and for all, eliminate the hassles and worries of spilling, splashing and dealing with harsh liquid pH adjusters. Use to adjust the pH of fertilizer and plant micronutrient foliar solutions.
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Earth Juice Natural Down 7.8 lb (4/Cs)
$57.99
If you need to measure the pH level of soil, media or substrates, then the Bluelab® Soil pH Meter is just what you need. This hand-held meter comes with a Soil pH Probe, Dibber/Auger, pH 4.0 and pH 7.0 calibration solutions, plus a helpful Quick Start gui
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Bluelab Soil pH Replacement Probe
$65.99
The Bluelab® Sample Pot is perfect for reservoirs located more than 6.5 feet from your controller unit. All you have to do is place the probes directly into the chamber for direct measurement of nutrient solution. All fittings are included. Compatible wit
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Bluelab Sample Pot
$154.99
The perfect solution to store and hydrate your Bluelab pH products. Bluelab® pH Probe KCl Storage Solution is made specifically for use with Bluelab® pH products. It is designed to increase response time and maximize the life of Bluelab pH pens and pH pro
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Bluelab pH Probe KCI Storage Solution 250ml (6/Cs)
$20.99
Hands-free monitoring and dosing of solution pH levels. Our clever pH controller automatically monitors and fine-tunes the pH levels for you. You simply set it, and forget. The pH is taken care of. For use with reservoirs up to 200 US gal/760 L. Plant-saf
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Bluelab pH Controller Power Supply
$31.99
The perfect, portable way to accurately measure and monitor pH levels in a wide range of media. We have combined the Bluelab® Multimedia pH Meter and Bluelab® Leap™ pH Probe to take fast accurate measurements in nutrient solution, soil, coco coir, rockwoo
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Bluelab Multimedia pH Meter (Leap Probe Included)
$194.99
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