be used as a reference for the measured area, which cannot be
equivalent to the measured area.
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.
NOTE:
If the laser is turned on at the time of the measurement, the
instrument irradiated a multi-point laser, The region shown by
multi-point laser can only be used as a reference for the measured
area, which cannot be equivalent to the measured area.
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 cannot measure the temperature of target
objects through the surface of glass.And steam, dust, smog will
lower the accuracy.
