Digital Psychrometer Thermometer Hygrometer with Backlight, ERAY Temperature and Humidity Reader Meter Thermo-Hygrometer with Dew Point and Wet Bulb Temperature, 9V Battery Included(Yellow)

2-IN-1: This digital psychrometer is designed to combine the functions of humidity meter, temperature meter, wet bulb and dew point temperature. The dew point is a measure of how much water vapor actually in the air | BACKLIGHT LCD DISPLY: ERAY temperature and humidity gauge is equipped with a bulb light in the LCD screen, user can easy to read the measurements in the darkness | DUAL DISPLAY: Temperature range: -30 C~60 C (-22 F~140 F); Humidity range: 0~100 percent RH; Wet bulb/ Dew point temperature range: -50 C~60 C (-58 F~140 F) | EASY TO USE: Unit switcher: C and F; Temperatue mode switcher: normal, dewpoint and wet bulb), Max Hold and Min Hold Function; Auto shutdown without operation after 12 minutes | WIDELY USED: Used for HVAC, industry, agriculture, meteorology, medical, daily life, building engineer, paranormal investigator, in wine cellar, machine room, data storeroom and etc