Features: _x000D_ 100% new and high quality. _x000D_ Temperature Range: -30 Centigrade~50 Centigrade _x000D_ Humidity Range: 0%RH~100%RH _x000D_ Temperature Error: less than 10 Centigrade: 2 Centigrade, -10 Centigrade~40Centigrade: 1.5 Centigrade, more than 40 Centigrade: 2 Centigrade _x000D_ Humidity Error: less than 40%RH: 10%RH, 40%RH~75%RH: 7%RH, more than 75%RH: 10%RH _x000D_ Use for: Home, office, hotel, restaurant, school, meeting rooms, factories, shopping malls, warehouses, waiting room, hospital, yard, garden, etc. _x000D_ Humidity Calibration Method: _x000D_ 1. Put a wet towel to cover at the back of meter or wrap up the entire about 30 minutes. _x000D_ 2. At this time the meter should display the humidity readings is at 95% RH _x000D_ 3. If the pointer does not point to 95%RH, please use the screwdriver to open the back shroud and calibrate to 95%RH (or do not need to open the back shroud, just calibrate directly at the back of the meter) _x000D_ Specifications: _x000D_ Material: Plastic _x000D_ Color: White,Green _x000D_ Size: 22.5*6.5cm _x000D_ Package Includes: _x000D_ 1 * Analog Household Thermometer Hygrometer