emperature Range: -40 ~ +85Resolution rate of temperature: 0.06Precision of temperature: + 2Range of humidity: 0~100RH%Resolution rate of humidity: 0.03RH%Precision of humidity: +5 RH% (20RH%~90 RH%)Signal indication: red light when workingRecharging method: PC or AC transfer USB port adapterWeight: 21gColor: SilverMaterial: MetalSize: 4.9 x 1.6 x 1cm/1.9 x 0.6 x 0.4in(L x W x T) TEMPerHUM thermometer & hygrometer is a measurement device using USB port to connect to a computer or other machines. It can measure the temperature and the humidity of the machine and the environment accurately and can calculate the dewpoint automatable. It must be connect to the computer to start working .Hid TEMPerHUM can be use in computer room, weather, environment and special environment temperature and humidity testing.Support Email and the remote viewing of MSN and SkypeSupport data recording, dynamic curves analysing and alarmingCompatible with Windows XP, Windows 7It can transmit the temperature to excel and other textfiles with NumLock/CapsLock. This function supports DOS, Windows, Linux, Mac