optris PI 160 Operator's Manual page 66

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1. Set the emissivity to 0.95 and take the temperature of the sticker.
2. Afterwards, determine the temperature of the adjacent area on the measuring object and adjust
the emissivity according to the value of the temperature of the sticker.
3. Cove a part of the surface of the measuring object with a black, flat paint with an emissivity of
0.98. Adjust the emissivity of your infrared thermometer to 0.98 and take the temperature of the
colored surface.
Figure 35: Shiny metal surface left and blackened metal surface right
4. Afterwards, determine the temperature of a directly adjacent area and modify the emissivity until
the measured value corresponds to the temperature of the colored surface.
CAUTION: On all three methods the object temperature must be different from ambient temperature.