HANNA GROLINE WATERPROOF pH TESTER

Description

HANNA GROLINE WATERPROOF pH TESTER is the professional-grade waterproof pH pen from Hanna Instruments — one of the most respected names in analytical measurement equipment worldwide. We have been recommending Hanna pH testers to UK hydroponics growers since 2017 because accurate, reliable pH measurement is the foundation of successful nutrient management, and Hanna’s build quality, calibration stability, and probe longevity set a standard that consumer-grade pH pens cannot match.

Why the Hanna Groline Is Worth the Investment

Cheap pH pens are one of the most costly false economies in the grow room. An inaccurate meter that reads 0.3–0.5 pH units away from true leads directly to chronic nutrient lockouts, deficiencies, and growth issues that are diagnosed as everything other than what they actually are — bad pH data. The Hanna Groline Waterproof pH tester uses a premium glass electrode with a proven gel-fill formulation that maintains calibration for extended periods between checks, features automatic temperature compensation (ATC) that corrects for the effect of solution temperature on pH readings, and is housed in a fully waterproof body that survives the inevitable submersions and splashes of an active grow room without performance degradation.

Calibration and Care for the Hanna Groline

Calibrate using Hanna’s own pH 4.01 and pH 7.01 buffer sachets — two-point calibration takes under two minutes and should be performed weekly during active grows. After each measurement rinse the electrode with clean water and replace the protective cap with a small amount of electrode storage solution to keep the glass hydrated between uses. Never store with the cap dry — a desiccated glass electrode drifts permanently and cannot be fully restored. Replace the electrode annually or when calibration becomes unstable despite fresh buffer solution, and keep spare electrode storage solution in your grow room kit.

Pair the Hanna Groline Waterproof pH Tester with the Hanna Groline Waterproof EC Tester and a set of Hanna calibration buffer sachets for a complete, professional-grade nutrient measurement kit that underpins every successful grow.