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pH, water & meters

pH up and down, calibration fluids, RO filters and the meters to read it all.

pH and water treatment shelf at Green Zone Grow Shops, photographed October 9, 2026

pH up and down, calibration fluids, RO filters and the meters to read it all.

Brands we photographed on this shelf: Bluelab, Hanna Instruments, Milwaukee, General Hydroponics, Advanced Nutrients, TNB Naturals, Clear Rez, HydroLogic.

Every brand on this page was photographed in our store at 62 Madison St, Worcester, on October 9, 2026. Stock moves, so if you need a specific product or size, call (508) 459-9609 before you drive. If it's not in, ask us.

Get directions · Call to check a bag: 508-459-9609 · Back to In the Store

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