These thermometers are designed for use in specific applications. These Durac thermometers feature markings that are permanently printed on the glass, individually serialized, and red spirit liquid that has a dark scale contrasts against a white background. Some thermometers are PTFE coated for added safety which may cause a slight change in accuracy up to 1 division.

Oven thermometers - designed for high temperature applications and feature a round glass swell to hold the thermometer in place