Protmex MS6508 Digital Temperature Humidity Meter Digital Psychrometer Thermometer Hygrometer Humidity Monitor with Temperature Gauge Humidity Meter with Dew Point and Wet Bulb Temperature Hygrometer This MS6508 Digital Thermometer Hygrometer is a new type of digital temperature and humidity meter, which designed to combine the functions of humidity meter, temperature meter, wet bulb temperature and dew point temperature. And Dew point is a measure of how much water vapor actually in the air. Dual Display Humidity and Temperature with Accurate Measuring: Humidity range: 0% - 100%RH. Temperature range: -20(-4) - 60(140). Dew point Temperature :-50(-58) - 60(140). Wet Bulb Temperature:-20(-4) - 60(140). Digital humidity and temperature meter used for a high range of applications-HVAC,industry,agriculture,meteorology,medical,daily life,building engineer,paranormal investigator,in wine cellar ,machine room and data storeroom Multiple Function: With data retention, data storage, unit conversion, backlight, low battery indicator, automatic shutdown, maximum and minimum functions. LCD display with backlight with high accuracy sensor, LCD brighter in the darker places, auto power off after 15 seconds This Digital Thermometer Hygrometer is a battery meter for measuring relative humidity and temperature. The Thermometer Hygrometer can display three types of temperatures around the sensor&#039;s air via several convenient procedures: The ambient temperature, the dew-point temperature and the wet bulb temperature. Data Hold Display Back Light MAX/MIN Data Logging up to 100 groups Low battery indication Use in living and office area, machine room, data storeroom, traffic environment, timely knowing the temperature and humidity, playing an important role in building a healthy life. Use to check the plants living condition, when planting flowers and trees. Use to keep track of bad moister on sound equipment witch can harm electronics. Use to check the performance of heating and air conditioning equipment accurately by building engineer. Use to keep careful track of the humidity in wine cellar. HVAC must have, good for superheats,fast accurate readings. Wonderful meter for ghost hunters or paranormal investigator. Ambient temperature: Realtive Humidity: Wet Bulb temperature: Dew point temperature: Product Size: 184mm60mm29mm(7.2x.4x1.1) Product Weight: 190g(0.41lb) Category: CE 1*TEMPERATURE AND HUMIDITY METER 1*User manual