Temperature Humidity Meter, SQECH Digital Hygrometer with Ambient Thermometer,Dew Point,Wet Bulb,Flashlight,Max/Min,Data Hold,High Precision Psychrometer Monitor with Color Backlight for Home HVAC sold2021 The blue light flashes once

The blue light flashes once every second

Just insert 2 AAA batteries(not included) to work

Performance Upgrade: Replaces worn-out cables to restore accurate throttle control

[IP67 Waterproof]: Sealed to IP67

Material: Plastic+Copper

Temperature Humidity Meter, SQECH Digital Hygrometer with Ambient Thermometer,Dew Point,Wet Bulb,Flashlight,Max/Min,Data Hold,High Precision Psychrometer Monitor with Color Backlight for Home HVAC sold2021 The blue light flashes onceTemperature Humidity Meter, SQECH Digital Hygrometer with Ambient Thermometer,Dew Point,Wet Bulb,Flashlight,Max Min,Data Hold,High Precision Psychrometer Monitor with Color Backlight for Home HVAC Product Features Temperature and Humidity MonitorThis digital temperature and humidity meter not only displays ambient temperature and relative humidity on one screen, but can also test dew point and wet bulb temperature by pressing the function button as