Grodan Gro-Block Improved GR6.5 Small with Hole, Unwrapped, 4" x 4" x 2.5" - Case of 216 Storage Bags the meter does not need

the meter does not need calibration

measurement comparison

Blade material is Japanese surgical-grade stainless steel offering serious cutting capacity in a durable lightweight package

Jetfans are the ideal solution for your ventilation needs

This cost effective umbrella style reflector provides unbeatable lighting performance

Grodan Gro-Block Improved GR6.5 Small with Hole, Unwrapped, 4" x 4" x 2.5" - Case of 216 Storage Bags the meter does not needNew and improved stone wool substrate with advanced wetting technology from Grodan Introducing Grodan Gro Blocks Improved, a product specifically engineered to deliver real results for your crops, developed by plant scientists, researchers, and top growers. A core component of the "Precision Growing" philosophy, Grodan Gro Blocks Improved with Advanced Wetting Technology allow you to cultivate more uniform and high quality crops while using less water