Grodan Gro Block Improved GR6.5 Small 4" w/Hole, 4" x 4" x 2.6" Strip - Wrapped (Case of 36 Sleeves) Under Canopy This probe is recommended for

This probe is recommended for use with the HI981420 GroLine Hydroponic Nutrients Monitor for pH

Watch for high pressure ─ The Bluelab Sample Tube is not intended for use in a high-pressure system

SST 28% Silica has a low molecular weight for enhanced uptake and is manufactured to be stable at pH ranges as low as 3

Treat the tumbler the same way you would treat a non-stick pan at home by letting it soak in warm

Grodan Gro Block Improved GR6.5 Small 4" w/Hole, 4" x 4" x 2.6" Strip - Wrapped (Case of 36 Sleeves) Under Canopy This probe is recommended forGrodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops. The result of months of scientific research and trials is Grodan Gro Blocks Improved with Grodans Advanced Wetting Agent. These leading edge blocks have the optimal fiber structure and physical properties for crop uniformity, more