Technical parameters: Appearance size: 117*119*30mm Battery specification: 3.6v lithium battery Battery life: it can be used continuously for more than 1 year in power saving mode Applicable environment: - 20 ℃ ~ 60 ℃ Measuring range: - 40 ℃ ~ 100 ℃ (external);- 20 ℃ ~ 60 ℃ (built-in) Measurement precision: temperature in - 20 ℃ ~ 60 ℃ to + / - 0.5 ℃, the outside is + / - 1 ℃ Resolution: LCD display, 0.1 ℃ LCD single way Storage capacity: the standard capacity is 9898 group, which can be expanded according to the actual demand Sampling interval: 2 seconds ~24 hours optional Communication interface: RS-232 /USB Sensor: built-in NTC (temperature), honeywell (humidity), external can be equipped as required