Beta 1760/IR1000 Mode D'emploi page 39

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Emissivity
Emissivity is a term used to describe the energy-emitting characteristics
of materials. Most (90% of typical applications) organic materials and
painted or oxidized surfaces have an emissivity of 0.95 (pre-set in the
unit). Inaccurate readings will result from measuring shiny or polished
metal surfaces. To compensate, cove the surface to be measured with
masking tape orflat black paint. Allow time for the tape to reach the same
temperature as the material underneath it. Measure the temperature of
the tape or painted surface.