Thermo-Hygrometer THC-620, THC-625, THC-626 Features: Large LCD screen display temperature and humidity and clock Three carton icons express different feeling Celsius and Fahrenheit conversion MAX or MIN temperature and humidity automatic memory function Switchable Celsius or Fahrenheit button on the back Technical data Operating voltage: 1.5VDC AAA Battery Frequency : 50 to 60HZ Sensing element : Polymer capacitor, SENSIRION Temperature measurement range: -20 centigrade to +70 centigrade (-4F to +158F) Humidity measurement range: 10 percent to 99 percent RH Temperature accuracy: + -3 percent to + -5 percent 5 percent to 8 percent RH Size : 110 multiply 100 multiply 20mm Installation type : Table standing or wall mounting Mini type available