Patent ID: 7347002

Claim:
A caliper device for measuring a barrel internal diameter and a barrel length comprising: a barrel member having an opening and a first and second internal wall surface; a first fixed probe transversely appended to a distal end of a cross member; a second probe, proximate to the first probe, affixed to a body member appended to the cross member, said second probe and body member slidable along the cross member axis, said first and second probe inserted in communication into said barrel member opening; a first measuring device affixed to the body member, said measuring device activated by opening of said second probe engaged within said barrel member measuring the barrel internal diameter proportional to the degree of expansion of the first and second probes, a second measuring means contained thereon the first and second probes; and, a recoil means contained within the cross member attached to the body member for expansion of said probes biased against the first and second internal wall surface.