Portable 4 In 1 Hydrogen-Rich Test Pen H2 Enrichment PH/ORP/TEMP Water Quality Meter TesterProduct Features: It is a multifunctional water quality pen product that can measure pH, ORP oxidation reduction potential, H2 enrichment, and temperature. It is a water proof water quality test pen with four functions. It has high performance, pen shaped design, fast numerical stability and convenient to use, simple to operate, solid quality. Accurate results. Specifications: PH test range: 0. 01 14. 00pH Resolution: 0. 01pH Accuracy: 0. 05pH ORP