Thermometer & Hygrometer Weather Station with Color Comfort Meter in Metal Casing (SILVER) Thermometer & Hygrometer 3 color comfort meter: cold, comfort, hot Past 24 hrs maximum&minimum record for temperature & humidity Temperature measurable range: 14F ~ 122F ( -10C ~+ 50C). Humidity measurable range: 20%~ 99% Powered by 2 X AAA batteries ( batteries are included)