about this article Measurable temperature range: -50+70, temperature measurement accuracy: 1. Humidity measurement range: 10%~99%RH, humidity measurement accuracy: 5%RH (room temperature 25C). Product Dimensions: 48 x 28.6 x 15.2mm. Batteries: 2 x LR44 button batteries. Small portable device for temperature and humidity measurement suitable for any type of environment. Humidity and Temperature Monitor: This portable thermometer and hygrometer measures indoor humidity and temperature, giving you information about the condition of the air in your room. Wide Application: The digital thermometer with the smallest LCD display is very popular and widely used in living room, greenhouse, musical instrument room, wine cellar, warehouse, baby room and closet.