Measures temperature range from -50 to 70°C with a deviation of ±1°C. Accurate indoor humidity monitoring from 10% to 99% RH with a RH deviation of ±5%. Compact and mini design (48 x 29 x 15 mm) for discreet placement in different environments. Ideal for use in schools, hotels, laboratories, aquaculture, workshops, factories, etc. Operates with 2 AG13 button batteries per unit, replace the batteries when the display fades.