Milwaukee 2277-21 M12 Laser Temp Gun HVAC Kit Infrared Surface Temperature Measurement from -22 to 1472 F (-30 to 800C) Contact Surface Temperature Measurement from -40 to 1022F (-40 to 550C) 40:1 Distance to Spot Ratio. Measures a one foot spot from 40 feet away Measure Ambient Humidity and Dew Point Contact Temperature Measurement