Grodan Improved Gro-Slab - (36x6x4") (Case of 12) Disc Filters amplified pH electrode with a

amplified pH electrode with a built-in EC/TDS and temperature sensors

which throws the spray pattern off the bench

so no adapters needed

USA except for CA

Grodan Improved Gro-Slab - (36x6x4") (Case of 12) Disc Filters amplified pH electrode with aGrodan Improved Gro Slab (36x6x4") (Case of 12) Experience the pinnacle of cultivation technology with the Grodan Improved Gro Slab (36x6x4"). This state of the art slab has been meticulously designed, keeping in mind the intricate needs of both hobbyist and professional growers. Grodan's Unique Stonewool Composition: Unlike conventional rockwool brands that derive all sizes from a single wool batch, Grodan stands apart. We produce different fiber