- Pen battery compartment stand about 2000h - LCD display power PH - Temperature sensor - Up and down the waterproof ring design - Replaceable electrode PH pen reuse - Automatic Calibration PH value and temperature dual display Specifications: Display: LCD digital TDS factor: 0,5 Temperature accuracy: ±0,5 °C Temperature resolution: 1 °C/°F Operating temperature: 0~80°C Temperature range: 0-60 °C / 32-140 °F Standby time: approx 2000 hours Display contents: power capacity, PH value, temperat