Portable 4 In 1 Hydrogen-Rich Test Pen PH/ORP/TEMP Water Quality Meter Tester Product 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 test range: ±1200mV Resolution: 1mV Accuracy: ±2mV H2 test range: 0-2400ppd; 0.001-2.400 Resolution: 2ppb; 0.001ppm Accuracy: ±10ppb; ±0.01ppm Temperature test range: 0.1-60.0℃ 32.0-140℉ Temperature accuracy: ±0.5℃ Temperature resolution: 1℃/℉ Automatic shutdown: 5 minutes Battery: 4x1.5LR44(Not Included) Display size: 33*24mm Size: 183*37*37mm (7.2*1.5*1.5in) Display: optional backlight, LCD digital display Waterproof rating: IP67 Temperature compensation: automatic temperature compensation 0-60v1℃ Working environment: 0 to 60.0℃ (32.0-140℉); RH 100% Package Contains: 1x 4 In 1 Hydrogen-Rich Test Pen PH /ORP/TEMP Water Quality Tester