Zinc Colorimetric Test Strips Elm Dirt Compatible with all grow mediums

Compatible with all grow mediums like rockwool

Driver - Designed by Medic Grow and manufactured by Sosen

we suggest adding the H2O2 solution approximately once every week or two

weather permitting

Zinc Colorimetric Test Strips Elm Dirt Compatible with all grow mediumsZinc Test Strips: 0 to 50 mg L Convenient, on site water testing Use for quick spot checks to ensure water quality. These new water test strips are perfect for field testing, process control, and analytical and research applications. Strips are easy to use: simply dip the strip into water sample to be tested, remove strip, and compare resulting color change to enclosed color chart. Tests take approximately 1 to 10 minutes. Strips are packaged 100 pk.