Description : Mini round digital design , clear & amp ; simple LCD display , allows you to easily know the environment temperature and humidity around you . Overall Diameter : Approx . 45 . 2mm / 1 . 78inch ; Opening Diameter : Approx . 41mm / 1 . 61inch ; Rated Voltage : DC 1 . 5V . Temperature Measuring Range : - 50 ~ 70 ℃, accuracy :± 1 ℃ ( at normal temperature ); Humidity Measurement Range : 10 %~ 99 %, accuracy :± 5 % ( Measures conditions every 10s ). Measure indoor humidity and temperature in time , help to adjust the humidifier , dehumidifier settings and humidistats , great for monitoring family &# 39 ; s living conditions and health . Wide Application : Applicable for tank , reptile habitat tank or box , home , office , car , schools , hotels , laboratories , kindergartens , aquaculture , instrument workshop , libraries , schools , factories and places equipped with air condition , etc . Specification : Product Name : Digital Thermometer Humidity Material : Plastic + Electronic Components Overall Diameter : Approx . 45 . 2mm / 1 . 78inch Opening Diameter : Approx . 41mm / 1 . 61inch Rated Voltage ： DC 1 . 5V Humidity Measurement Range : 10 %~ 99 %; Accuracy :± 5 % ( Measures conditions every 10s ) Display Resolution : 1 % Temperature Measuring Range : - 50 ~ 70 ℃; Accuracy :± 1 ℃ ( at normal temperature ) Weight : 25g ( without battery ) Installation Type : Embedded Installation Package Includes : 1 Piece Digital Temperature Humidity Meter (3 Pack) Note : Please allow small error due to manual measurement . No contain batteries .