Description: 3 in 1 thermometer and hygrometer barometric accurately measures temperature, and judge weather change. 5inch round waterproof plastic clear cover and alloy housing, analog mechanical, adapt to four seasons and climate. No battery, built-in temperature and humidity sensor, will automatically sense and accurately measure, you do not need to calibrate. Large and clear dial reading easier, and there is a hole on the back for hanging it on the wall. Suitable for greenhouses, warehouse, offices, wine cabinet, garden, patio, home etc. Specification: Material: Alloy and Plastic Diameter:128mm/5.04inch Thickness:51mm/2.01inch Type:Pointer Hygrometer Humidity Barometer Temps Range:-20-120F Temps Resolution: 2F Temps Accuracy:±5F Humidity Range: 0-100% RH Humidity Resolution:2%RH Humidity Accuracy:±7%RH(40-70%RH) Barometric Pressure:970-1060hPa Barometric Pressure Resolution:1hPa Barometric Pressure Accuracy:±5hPa(970-1040hPa) Package Includes: 1 Piece Hygrometer Humidity Barometric Meter : Please allow slight dimension difference due to different manual measurement.