Dial Thermometers are mechanical temperature indicators consisting of a pointer precisely connected to a bimetal helix stem which moves due to temperature changes in the bimetal helix. It is fabricated with extreme tolerances, which results in a very sensitive temperature reading.

An anti-parallax dial is used with a concave design of the dial ring to enhance readability. Graduations for each temperature range are calculated to match deflection data of bimetallic materials. Stainless steel housing is used for corrosion resistance and the complete assembly is hermetically sealed.