Description: 2-in-1 thermometer and hygrometer accurately measures temperature, can record the highest and lowest temperature of the day. Analog mechanical, built-in temperature and humidity sensor, will automatically sense and accurately measure, no battery required. 5inch round waterproof large and clear dial reading easier, and there is a hole on the back for hanging it on the wall. The meter has three pointer, black for real-time temperature; red for highest temps; blue for lowest temps. Suitable for greenhouses, warehouse, offices, wine cabinet, garden, patio, home etc. Specification: Material: Alloy and Plastic Diameter:128mm/5.39inch Thickness:43mm/1.69inch Type:Pointer Hygrometer Humidity Temps Range:-20-50°C Temps Accuracy:±2° C Temps Resolution:1°C Humidity Range: 0-100% RH Humidity Accuracy:±5% RH Humidity Resolution:2% RH Package Includes: 1 Piece Hygrometer Humidity Meter : Please allow slight dimension difference due to different manual measurement.