Spencer Model 975 75ft Loggers-Diameter Combo Tapes, a 50 year industry standard, measure length on one side in graduated 1/8" intervals and diameter on the other in 1/10" intervals. Constructed with a blue, aluminum sturdy case, hardened steel gears and pinion, and a powerful spring return, Spencer Diameter Combo Tapes are fully automatic. The open reel design allows for easy cleaning and debris removal which reduces blade wear and extends the life of the tape. Finally, the convenient swivel belt clip ensures that your Spencer Tape is there when you need it, always within hand's reach.