Hanna GroLine Monitor GH Use the mesh side for

Use the mesh side for sheets of A-OK's

pH and temperature meter all-in-one

The Original will provide a 4x4 foot or 128 cubic foot space with CO2 for 6 months guaranteed

450 gallons per hour

Hanna GroLine Monitor GH Use the mesh side forThe HI981420 GroLine Monitor for Hydroponic Nutrients provides around the clock, continuous monitoring of pH, conductivity (EC & TDS), and temperature in hydroponic nutrient solutions. Quick to setup, simple to use, this monitor was designed with Hydroponics, Aquaponics, and Greenhouses in mind. Make your nutrient solution easy to manage with the GroLine Monitor. Get 24 7 pH&EC measurements for consistent yields every time. Good Laboratory Practice