Total Meter HTC-1 Hygro-Thermometer (-10 °C ~ 50 °C, 10% ~ 99% RH)

Temperature measurement range: -10 °C to 50 °C (58 °F to 158 °F)

Humidity measurement range: 10% to 99% RH

Accuracy: ±1 °C; ±5% RH (at 60% RH)

Power supply: 1 × AAA 1.5 V battery