Amprobe IR-750 Infrared-Thermometer - Manual (Page 18)

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Emissivity
Emissivity describes the energy-emitting characteristics of materials. Most organic
materials and painted or oxidized surfaces have an emissivity of about 0.95.
If possible, to compensate for inaccurate readings that may result from
measuring shiny metal surfaces, cover the surface to be measured with
masking tape or flat black paint (<150°C / 302°F ) and use the high emissivity
setting. Allow time for the tape or paint to reach the same temperatures as the
surface beneath it. Measure the temperature of the tape or painted surface.
If you cannot use paint or use tape, then you could improve the accuracy of
your measurements with the emissivity selector. Even with emissivity selector, it
can be difficult to get a completely accurate infrared measurement of a target
with a shiny or metallic surface.
The Thermometer allows you to adjust the emissivity for the type of surface
before measured.
Refer to Table of Surface Emissivity. But it is only a typical case. You could base
on your own case and materials to have different setting.
Reminders
1. Changes of surrounding ambient temperature can result in inaccurate
reading, allow time for the instrument to adopt the change of ambient
before use. Specified accuracy applies after 30 minutes when the
instrument changes to a different environment ambient.