2
3. Distance Spot Ratio
The farther the target, the larger the testing spot area, it means: As
the distance from thermometer to the object increases, the spot size
of measuring area becomes larger,
(as in diagram 1)
it is named as
“D:S” (Distance Spot Ratio). The diameter of the target spot area is
3.0cm when you test from distance 36cm, and the thermometers will
show the average temperature of target spot area with diameter
3.0cm.
4. Emissivity
Most organic materials, painted or oxidized surfaces have an
emissivity of 0.95 (pre-set in the unit). Inaccurate readings will occur
if the surface to be measured is shiny or polished such as stainless
steel or aluminum. To obtain better accuracy, please cover the
surface with masking tape or flat black paint before measuring.
Measure the tape or painted surface when the tape or painted reach
the same temperature of the material underneath. Please kindly
note: thermometer can not measure the temperature of target
objects through the surface of glass. And steam, dust, smog will
lower the accuracy.
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