Emerald Harvest pH Down 6 Gallon/22.71 Liter 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

Emerald Harvest pH Down Gallon/3.79 Liter 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

Emerald Harvest pH Up 55 Gallon/208 Liter Keep your nutrient solution in the sweet spot with Emerald Harvest® pH Up. A pH reading below 5.5 is considered too acidic for most hydroponic gardens. This premium pH alkalizer allows you to raise the pH of yo

Emerald Harvest pH Up 2.5 Gallon/9.46 Liter Keep your nutrient solution in the sweet spot with Emerald Harvest® pH Up. A pH reading below 5.5 is considered too acidic for most hydroponic gardens. This premium pH alkalizer allows you to raise the pH of

Emerald Harvest pH Up Gallon/3.79 Liter Keep your nutrient solution in the sweet spot with Emerald Harvest® pH Up. A pH reading below 5.5 is considered too acidic for most hydroponic gardens. This premium pH alkalizer allows you to raise the pH of you

Active Air 3-Way Meter Gardeners can conveniently test their moisture, light, and pH levels with the handy Active Air 3-Way Meter. Moisture readings register on a scale of 0 (dry) to 10 (moist); light readings range from 0 LUX (low light) to 2000 LUX (

Active Air 2-Way Moisture pH Meter Gardeners can conveniently test moisture and pH levels with the handy Active Air 2-Way Meter. Moisture readings register on a scale of 0 (dry) to 10 (moist). pH readings between pH 3 (acidic) and pH 10 (basic) are rep

GH pH Up Liquid Gallon This Base solution is formulated using potassium hydroxide and potassium carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level.

Alchemist pH Down Non-Corrosive Gallon Alchemist pH Down is comprised of very pure, food-safe ingredients. This unique buffer is non-toxic, non-corrosive and non-hazardous, making it like no other pH buffer on the market. Alchemist pH Down Non-Corrosi

FEATURES Measures total dissolved solids (TDS) and temperature Automatic Temperature Compensation (ATC) Water-resistant housing Measurement Range: 0-5000 ppm Digital Calibration (push button) Auto-off function, data-hold function and low-battery i

Product Details NaCl calibration solution 1000 ppm comes in lightweight HDPE plastic bottles. Sealed with a coated foam liner.

pH Tester with 1 point manual calibration, ± 0.2 pH accuracy, range: 0.0 pH to 14.0 ph. Full-range pH tester. 30-day warranty, snap-over protective case, 7.01 calibration solution and calibration screwdriver are all included with unit. Range: 0.0 to 14

Olympus Up Quart One of a kind in the industry. Olympus is derived from micronized limestone designed to not only raise the pH of your nutrient solution, but also to buffer organic acids from healthy soil decomposition. The calcium in Olympus is also

Bluelab® Multimedia pH Meter with Leap™ pH Probe 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 measur

Bluelab® pH Pen Measures pH and temperature. Selectable units for °C and °F. Backlit LCD display. Double junction probe (not replaceable). Successful calibration indicator. Hold reading function and low battery warning. Fully waterproof with auto off f

Bluelab® ppm Pen — Now Bluelab® Conductivity Pen Measures conductivity and temperature. Selectable units for conductivity and temperature. Backlit LCD display with low battery warning. Successful calibration indicator and calibration is optional. Fully

HM Digital™ Waterproof pH Meter Model PH-200 Measures pH and temperature. Auto-ranging three point calibration with digital fine tuning. pH buffer 4 solution is in a sponge embedded in a clear cap. Measurement range: 0–14 pH with a waterproof housing.

HM Digital™ EC/TDS HydroTester Model COM-80 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.

GH pH Down 8 oz The acid formulation uses food-grade phosphoric acid to lower the pH to the proper level.

GH pH Down Liquid Quart The acid formulation uses food-grade phosphoric acid to lower the pH to the proper level.

GH pH Up Liquid Quart This Base solution is formulated using potassium hydroxide and potassium carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level.

GH pH 4.01 Calibration Solution Quart 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 e

GH pH 4.01 Calibration Solution 8 oz 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 ea

GH pH 7.01 Calibration Solution Quart 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 e