LCD display The opening size is 41mm in diameter (the measurement has a small error) Humidity display Humidity measurement range 10%?99% Humidity display resolution 1% The humidity sampling cycle is 10 seconds Humidity measurement accuracy 5% Rated voltage DC1.5v (1 AG13 button battery) Temperature measurement range -50 to 70 Temperature measurement accuracy 1 degree (under normal temperature) Battery installation: Flip to the back of this product Push open the battery cover in the direction indicated by the arrow Pi Put two button batteries into the battery slot Material: Acrylic+LCD Package Included: 1*thermometer ?BATTERIES NOT INCLUDED)