Even with the availability of Lo E Filter models, as a general rule higher emissivities require less careful attention to set-up details and calibration, and are more "forgiving" in long term service using any IR temperature measuring device. Accordingly it is recommended that where possible, surface emissiv-ity should be increased. If it is not possible to increase emissivity, then a Lo E Filter model should be specified. 

As an example, to control a metal roller temperature, paint either the end or an unused edge, and monitor with an IRt/c. A recommended paint for most service is 

RUST-OLEUMŽ 
7778 BAR-B-Q-BLACK 
Rated to 800°F (427°C)