Temperature Measuring Range: -50C ~ +70C; Operating Temperature: -10C~+50C; Measurement Unit: C / F Digital Thermograph with external thermistor and 95cm insulated wire, the fixed suction cups are designed for secure convenient placement. Easy-to-Read LCD Display Thermometer, quick to get the results, can switch between Fahrenheit and Celsius scale as you need, convenient to use. Enjoy convenient monitoring of parameters essential to Fish and reptile health, ideal for Aquarium or any place you want to monitor the temperature. Put the thermometer in place, then submerge the probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in the water, only the probe is waterproof) Specification Measuring Range : -58 F to +158 F (-50 C to +70C) Working Temperature: 14 to 122F (-10 to +50C) Maximum Precision: 0.1C Margin of Error: +/- 1C Measuring Temperature Unit: C F Sensor probe cable length: Approx. 3 foot (1 meter) color: black Package Included 1 x Aquarium thermometer 1 x LR44 button cell battery 2 x Suction cup mounts