Mitutoyo 139-181 4-68" Tubular Inside Micrometer
Each set consists of inside micrometer head and a series of extension pipes of different length, which are hardened, ground, micro-lapped and heat insulated. Satin chrome finished head with positive locking clamp and carbide measuring faces.
Accuracy:
Micrometer head stroke: 1".
Graduation: .001"
Instrument error: (3+qty of rod + L/50)m.
L = Maximum measuring length