Read indoor temperatures-hygrometer from inside your house. Large, easy-to-read LCD screen allows you to see the results even in bright sunlight. Unit runs off 1.5VDC AAA batteries. Features Click function display of "hour","minute",and "AM/PM", Time format switch able (12hours format or 24 hours format) Temperature measuring range: IN side temperature: -10~+60ºC(14~+140°F) OUT side temperature: -50~+70ºC(-58~+158°F) Precision: ±1ºC ( ±1.8°F) Resolution: 0.1ºC(0.1°F) Humidity measuring ranges:20%RH to 95%RH(Display between 20%RH~99%RH) Resolution:1% precision: ±8%RH Memorization of maximum/minimum temperature and maximum/minimum humidity.