Office Hospital Supermarket School Intelligent Thermal Camera Non Contact Automatic LCD Digital Forehead Thermometers Wall Hanging K3 PRO Infrared Thermometer High Quality Automatic LCD Digital Wall Hanging K3 PRO Thermometer 1. Standby: The red dot on the bottom of the display lights up in sequence. 2. Insufficient power: The horizontal bar lights up in the middle of the display. 3. Normal temperature: The green light flashes and the alarm "quotient". 4. Abnormal temperature: red light flashes and quotient alarm. 5. Default value: L0 ': ultra-low temperature alarm. "HI": Super high temperature alarm. Instructions for use 1. Temperature measurement: measure 5-10 cm in front of the thermometer. 2. Mode switching: Side button (1) Temperature unit: Press the "Mode Switch Button", then select "C" or "F" C: Celsius F: Fahrenheit