Fowler Tubular Inside Micrometer Fowler extension rod type Inside Micrometers have a wide measuring range any one single micrometer can replace many bar type inside micrometers. Features include... 2" - 12" Measuring Range 0.001" Graduations Accuracy: .00005" x (3 + L"/2) Each set consists of an inside micrometer head and a series of fully hardened and lapped extension rods of different lengths all with carbide measuring faces. Anvil and spindle are hardened and precision ground with microlap finish on ends. Spindle thread hardened, ground & lapped. Microfine graduations on satin chrome. Positive locking nut on spindle. It is recommended that the inside micrometer with a rod be calibrated by a micrometer or ring gage. Coiled spring pressure contact type rods are each marked with appropriate length. Quick, easy zero adjustment on the sleeve. Meets or exceeds Federal accuracy specs. Reference standard included with set. Includes a wrench and a case
