pH, TDS, EC, PPM
Bluelab Guardian Monitor
Adjustable brightness display. Large easy-to-read, plant-safe green LED displays. Selectable values for conductivity and temperature. Simple push button pH calibration system. No calibration required for conductivity and temperature. Silent alarm for both
$445.20
$267.12
General Hydroponics GH pH Test Kit 1 oz (24/Cs)
General Hydroponics pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator and observe the coloration of the liquid in the test vial. Many experienced growers prefer our pH Test Kit to expens
$9.59
$5.75
General Hydroponics GH pH Test Indicator 8 oz
General Hydroponics pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator and observe the coloration of the liquid in the test vial. Many experienced growers prefer our pH Test Kit to expens
$14.68
$8.81
General Hydroponics GH pH Down Liquid Quart (12/Cs)
The acid formulation uses food-grade phosphoric acid to lower the pH to the proper level.
$14.39
$8.63
General Hydroponics GH pH Up Liquid Gallon (4/Cs)
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.
$35.87
$21.52
General Hydroponics GH pH Up Liquid Quart (12/Cs)
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.
$14.39
$8.63
General Hydroponics GH pH Control Kit (12/Cs)
General Hydroponics pH Control Kit contains 8 oz pH UP, 8 oz pH DOWN, 1 oz indicator and vial.
$22.98
$13.79
General Hydroponics GH pH 7.01 Calibration Solution Quart (12/Cs)
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 p
$25.75
$15.45
General Hydroponics GH pH 4.01 Calibration Solution 8 oz (12/Cs)
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 p
$9.03
$5.42
Bluelab Combo Meter
The Bluelab Combo Meter is a conductivity, pH and temperature meter all-in-one. As the Bluelab Combo Meter is portable and does not require a power supply to operate, it can be used anytime and anywhere to help you manage your crops' daily nutrient requir
$348.74
$209.24
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 waterproof. Auto off function and hold reading func
$104.94
$62.96