Apera GroStar GS4-E Replacement pH/EC Combo Electrode Root Innoculant ALSO NON-PLANT FOOD INGREDIENT: 1%

ALSO NON-PLANT FOOD INGREDIENT: 1% Humic acid (derived from Lignite)

Say goodbye to spider mites

The self-sealing air filter traps up to 95% of pollutants from the air to protect your plants and the unit’s vital components

General Hydroponics pH Test Kits make pH testing easy

Apera GroStar GS4-E Replacement pH/EC Combo Electrode Root Innoculant ALSO NON-PLANT FOOD INGREDIENT: 1%AI58040 GroStar GS4 E replacement pH EC combo electrode Measures pH, conductivity (EC and PPM) and temperature Combo probe built with lithium glass membrane and titanium alloy to ensure high accuracy and durability Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance double junction structure uses blue gel electrolyte without the air bubble 1 year warranty