Mother Earth Hydroton Giant Soil PH Pen it can be used anytime

it can be used anytime and anywhere to help you manage your crops' daily nutrient requirements

Constant linear response curve (as opposed to other meters’ Gaussian response) yields higher accuracy independent of wavelength—perfect for measuring LED light output

Amperage: 120V: 6

Harness that power with Amino-Aide and see the results for yourself

and ease of use

Mother Earth Hydroton Giant Soil PH Pen it can be used anytimeThe original Hydroton brand expanded clay is a unique, lightweight expanded clay aggregate made in Germany. This natural clay is mined, formed into pellets, then kiln fired at high temperatures to cause the clay to expand into tough, lightweight balls. Hydroton brand expanded clay is semi porous and generally does not float like other products can. For best results, rinse all expanded clay before use. It is reusable as long as it is thoroughly cleaned