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General Hydroponics PH Control
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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...
Active Air CO2 Test Kit (Clearance)
Active Air
$10.00
We recommend measuring CO2 periodically to ensure optimum levels for growth. The Active Air CO2 Test Kit is an inexpensive alternative to costly electronic monitors. Use the tester kit to gauge...
GH pH Test Indicator (Solution) - 8OZ
General Hydroponics PH Control
$14.53
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...