... 1.a profesional manufactory thermo-hygrometer 2.environment, without battery 3.OEM Household Thermometer Temperature Humidity Piceture show:Back show:Detail Information ... range: 20%~100%RH3.Measuring Accuracy: Thermometer: ±1°C(-10~30°C),±2°C(other) Hygrometer: ±5 %( 40~70%),±9%( ... RoHS certification approved that our product meet environmental standards. Household Thermometer Temperature Humidity