With built-in high precision temperature and humidity sensor for measuring temperature, humidity, wet bulb and dew point, the temperature and humidity meter is small enough to be hold in your pocket. Features: 4-IN-1 METER: Accurately measure temperature, humidity, wet bulb and dew point. HANDY METER: Weighing only 1.62 ounces, measuring 7 by 1.2 by 1.2 inches, compact and lightweight, easy to carry around. PRACTICAL FUNCTIONS: Displays Celsius, Fahrenheit, Max. value, and Min. value. EASY TO READ: Green backlight ensures clear visibility even in the dim light. EASY TO USE: Without complicated instructions, extremely simple to use. AUTO POWER OFF: Auto power off after about 30 minutes if there is no operations, save the power. BATTERY POWERED: Powered by 2 pieces 1.5V AAA batteries. APPLICATION: Can be used in home, apartment, greenhouse, aquaculture, terrarium, etc. Note: *Please refer to the user manual carefully before use. *Batteries not included. Parameters: Ambient Temperature Range: -20℃~60℃ (-4℉~140℉); Ambient Temperature Accuracy: 0℃~45℃±1℃ (other: ±1.5℃); Humidity Range: 0.0%~99.9%RH; Humidity Accuracy: 20%~80%±3.0%RH (other: ±4.0%RH); Wet Bulb Temperature Range: -20℃~60℃ (-4℉~140℉); Wet Bulb Temperature Accuracy: 0℃~45℃±1℃ (other: ±1.5℃); Dew Point Temperature Range: -50℃~60℃(-58℉~140℉); Dew Point Temperature Accuracy: 0℃~45℃±1℃ (other: ±1.5℃); Specifications: Material: ABS; Color: Black and Red; Power: 2pcs, 1.5V, AAA batteries (Batteries Not Included); Item Size: 18*3*3cm / 7.08*1.18*1.18in; Item Weight: 46g / 1.62oz; Package Size: 21.5*5.5*4.3cm / 8.46*2.16*1.69in; Package Weight: 99g / 3.49oz; Packing List: 1 * Thermo-Hygrometer; 1 * User ManualManual