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  • Infrared Surface Temperature Measurement from -22 to 1472° F (-30 to 800°C)
  • Contact Surface Temperature Measurement from -40 to 1022°F (-40 to 550°C)
  • 40:1 Distance to Spot Ratio. Measures a one foot spot from 40 feet away.
  • Measure Ambient Humidity and Dew Point
  • High Contrast, White on Black Display with Backlight for easy reading
  • Extra Bright LED Floodlight increases usability in low light conditions
  • User Configurable Hi/Low Alarm Settings
  • Adjustable emissivity from 0.10 to 1.00 for increased accuracy
  • Unit Memory stores up to 20 temperature values


Distance to Spot Ratio 40 to 1
Temperature Range -22° to 1472°F (-30°C to 800°C)
Basic Accuracy 1.50%
Contact Temperature -40° F to 1022° F (-40° C to 550° C)
Display Resolution 0.1° F (0.1° C)
Response Time <500ms
Emissivity Adjustable 0.10 to 1.00
Data Storage Yes, 20 Points
Display Backlight Yes
Display Type White on Black LCD
LED Flood Light Yes
Alarm (HI/LO) Yes
Locking Trigger Yes
Humidity Measurement Yes
Dew Point Measurement Yes
Rugged Over-molding Yes
Certifications NIST
Switch Type Trigger
Battery Type M12™ REDLITHIUM™ Rechargeable
Tool Warranty 5 Years


The Laser TEMP-GUN™ M12™ Cordless Lithium-Ion Thermometer for HVAC/R (NIST) is a heavy duty pistol grip infrared thermometer for professional HVAC/R commercial and industrial applications. Powered by the Milwaukee M12 REDLITHIUM ™ battery, the 2277-21 can safely measure temperatures between -22 to 1472° F (-30 to 800° C) with a 40 to 1 distance to spot ratio for even the most demanding industrial
applications. In addition, the M12 Cordless Lithium-Ion Laser TEMP-GUN™ Thermometer for HVAC/R was designed with an extra bright LED flood light to increase end user productivity. A NIST Certificate of Calibration with Data is also included, needed by many organizations as proof of calibration with the date when NIST Calibration was performed. The 2277-21 is covered by the Milwaukee 5-Year Warranty.

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