6
NOTE: The first value indicates the temperature of an object; the second value indicates the
ambient temperature.
7. Distance to Spot Ratio
The thermometer has an optical angle and spot size as shown below.
Object
Focus tube Sensor
The target should be larger than the unit’s optical spot size. The distance to spot ratio for this
thermometer is 8:1 (8mm spot at 1meter) as shown below.
Distance (D) Spot size (S)
8. Emissivity
Emissivity is a term used to describe the energy emitting characteristics of a material. The higher
the emissivity value a material has, the more infrared energy it will emit at a particular
temperature. Most organic materials range in emissivity between 0.85 and 0.98. This thermometer
has a fixed (non-adjustable) emissivity of 0.95. Measuring objects with an emissivity of less than
0.95 will result in a lower than actual temperature reading on the display. Be aware of this
characteristic when measuring low emissivity objects (e.g. shiny, reflective metal objects).
9. Changing the Battery
When the battery is nearly exhausted, the low battery symbol will appear on the display.
The battery should be replaced soon after this occurs. Pinch the both side of the top of the battery
cover to swing it open as shown:
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