TESTO 883 - Selecting the emissivity

11 Performing the measurement
49
Material (material temperature) Emissivity
Steel, oxidised (200 °C)
0.79
Clay, burnt (70 °C)
0.91
Transformer paint (70 °C)
0.94
Brick, mortar, plaster (20 °C)
0.93
Reflected temperature information:
Using this offset factor, the reflection is calculated out based on the low
emissivity, and the accuracy of the temperature measurement with infrared
measuring instruments is improved. In most cases, the reflected temperature is
identical to the ambient air temperature. Only when objects with strong
emissions at much lower temperatures (such as cloudless skies during outdoor
readings) or much higher temperatures (such as ovens or machines) are in
proximity to the object being measured should the radiation temperature of
these sources be determined and used. The reflected temperature has little
effect on objects with high emissivity.
@ Further information can be found in the Pocket Guide.
11.5.1 Selecting the emissivity
1
Open the Menu.
2
Select Emissivity (joystick or touchscreen).

Emissivity opens.
3
Select Substance.
4
Confirm selection with  or exit the menu with X.