The Klein Tools IR07 is a dual IR (infrared) thermometer and probe thermometer. This rugged pocket thermometer measures temperature from -40 to 572-Degrees Fahrenheit (-40 to 400-Degrees Celsius) for both IR and probe measurements. The IR thermometer has a Distance-to-Spot ratio of 8:1 and the target laser can also be used as a laser pointer. The Probe accurately measures air, liquid and surface temps and has a convenient hook for hands free indoor measurements. The IR07 quickly calculates differential temperature (T1-T2) and has a backlit LCD for easy viewing in low light.