PTC® manufactures pipe thermometers specifically designed to measure the surface temperature of pipes & cylinders. There are 2 mounting options available. The "CLIP" is used for overall pipe dimensions 3/4" to 2 3/8" and the "SPRING" is used for pipes up to 6". For pipes having O.D.’s larger than 6 inches, two spring kits can be combined to reach around the pipe. Choose from 8 different temperature ranges. The insulating and seating cup houses the bimetallic sensor. The 488F & 488C Models have an aluminum insulating cup for use up to 500°F.