2.5 Vapor Thermometer, -40 Degree Service Fill, Chrome Bezel w/ U-Clamp, 30 to 300 Degrees F/C, Armored Copper Capillary, 25 ft, 1/2 NPT Union Copper Bulb, 4 x 3/8

2.5 Vapor Thermometer, Glycerin Fill, Chrome Bezel w/ U-Clamp, 30 to 300 DegF/C, Armored Copper Capillary, 30 ft, 1/2 NPT Union Copper Bulb, 4-1/2 x 3/8. Indicates media temperature using a temperature-actuated liquid in the sensing element and a highly accurate, high quality pressure gauge. As the media temperature increases, the capillary fill fluid vaporizes, increasing pressure in the Bourdon tube to activate the movement and pointer for proper indication. Brass, stainless steel, or phenolic case. Dry or liquid filled. Bottom, back or lower back connected. The dial scale graduations are non-linear, therefore the highest degree of accuracy and readability is found in the upper half of the scale.