FIELD: measurement technology. SUBSTANCE: inside calliper has a micrometric head with an indicator, two extension pieces, compound measuring rod and tip. The houses of extension pieces are composed of a clutch, union and coupling connected to each other with the aid of thread. The inside calliper is provided with aligned bushings for receiving the ends of compound measuring rod and with axially and radially elastic members for providing the centering of rod in the housing and for pressing one portion of the rod to another. To prevent the rod from falling out from the housing the device is provided with a pin. EFFECT: enhanced accuracy. 4 dwg
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