Amprobe IR-712 IR-720 IR-730 Infrared-Thermometers - Manual (Page 12)

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Field of View
Make sure that the target is larger than the spot size. The smaller the target, the closer you should be to it.
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 setting for the type of surface before taking measurements.
To determine the adjustment setting please refer to Table of Surface Emissivity.
Reminders
1. Changes of surrounding ambient temperature can result in inaccurate readings, allow time for the
instrument to adopt the change of ambient temperatures before use. Specified accuracy applies after 30
minutes when the instrument changes to a different environment ambient temperatures.