This thermometer is a working rediation thermometer that can determine its surface temperature by measuring the infrared energy rediated from the surface of the target body. Features: Air Conditioner Temp Regulation: Use a temperature measuring machine to measure and maintain whether the air conditioner temperature is normal. Non-contact Induction Temp Measurement: No need for close contact, just hold one touch to measure temperature, non-contact is safer and faster. Correct Measurement: Do not let the steam come into contact with the temperature sensing area, and maintain the measurement angle at 50°-60°. High/Low Temp Alarm Preset: Long press and hold the temperature measurement button, and the red light flashes to indicate exceeding the preset value. VA Anti Highlight Screen: Overloading and high temperature of the electrical box can easily lead to aging of the wire coil and insulation. Specifications: Color: Black / Orange (Optional) Material: ABS Measuring Range: -20~650 / -4~1202 Environment Operating Range: 0~50 / 32~122 Measuring Distance: D:S=12:1 Response Time: 500 ms gap, 94% response Emissivity: Preset 0.95 adjustable Auto Shutdown: About 7 seconds without operation then auto power off Battery: 9V battery (Not included) Screen Display: VA bright screen Zero Offset: Yes Mean/Difference: Yes Low Battery Prompt: Yes Infrared Laser: Yes / Adjustable: Yes Maximum and Minimum Values: Yes HOLD Data Retention: Yes High and Low Temperature Warn: Yes Backlight Setting: Yes Reminder Tone/Mute: Yes Item Size: 153 * 91.5 * 40.6mm / 6.02 * 3.60 * 1.59in Item Weight: 143g / 5.04oz Package Weight: 259g / 9.13oz Package Size: 20.5 * 13.8 * 5cm / 8.07 * 5.43 * 1.97in Package List: 1 * Infrared Thermometer 1 * User Manual (English)