Feature:1. High Accuracy Sensor: With built in smart GXHTC3 humidity and temperature sensor, the temperature and humidity Meter can provide you with latest precise data every 2s.2. Back Support: There is support at the back of the meter, which allows the meter to be placed at the desktop. Four vents give air wide access to internal sensors3. Threshold Alarm: Thresholds for temperature and humidity can be set respectively. there will be a buzzer warning sound and the alarming light will flash when the temperature and humidity exceeds the threshold.4. Temperature and Humidity Probe: The temperature and humidity probe will detect the Humidity and temperature, make sure you are always aware of your surrounding change and maintain a comfortable ambient.5. Clear LED Display: Large screen digital display allows you to confirm the temperature and humidity keeping in an appropriate range anytime.Specification:Item Type: Temperature and Humidity MeterMaterial: ABSColor: BlackAmbient Temperature: -20C -80C, 1.0CRelative Humidity: 0-100%RH, 4%RHOperating Temperature: -20~ 80COperating Humidity: 45%-80%RH, altitude 2000mDisplay Mode: LED digital tube, single word 1.8 inchSensor: GXHTC3Sampling Rate: 2 times/secondOver Range Display: "Hi" or "Lo"Operating environment: -20-80C, maximum relative humidity of 80%, indoor altitude < 2000mStorage temperature: 0 C -60 CPower supply: DC 5V/1A.Package List:1 x Temperature and Humidity Meter1 x Power Line2 x Hanging Hook1 x Locating Piece2 x Screw1 x Instruction Manual Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.