Emissivity of Digital Infrared Thermometer Non contact" 

EMS (Emissivity): most 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 for this, cover surface to be measured with masking tape or flat black paint. Measure the tape or painted surface when the tape or painted reach the same temperature as the material underneath.

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Digital Infrared Thermometer Non-Contact Laser Termometer IR LCD Display Temperature Meter Gun Pyrometer Temperature Instruments