Hanna Instruments HI98121 pH ORP Combo Meter & Temperature Gauge/Monitor, Green

Waterproof pH, ORP combo, and temperature meter that has temperature compensation, a hold feature, and more Specifications: pH range: -2.00 to 16.00 pH pH resolution: 0.01 pH pH accuracy: ±0.05 pH ORP range: ±1000 mV ORP resolution: 1 mV ORP accuracy: ±2 mV Temperature range: -5.0 to 60.0°C / 23.0 to 140.0°F Temperature resolution 0.1°C / 0.1°F Temperature accuracy ±0.5°C /±1°F pH calibration: automatic, at 1 or 2 points w/ 2 sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18) Temperature compensation: automatic for pH readings Battery type/life: 1.5V (4) / approx 250 hrs of continuous use; auto-off after 8 min of non-use Electrode/probe: HI73127 replaceable pH electrode (included); fixed ORP sensor Environment: -5 to 50°C (23 to 122°F); RH max 100% Color: Green Dimensions: 163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’) Weight: 0.3 pounds Manufacturer warranty: 2-year warranty