A barrel measuring device for accurate measurement of all internal
dimensions and barrel wall thickness of a gun, tube, pipe or cylinder is
comprised of a fixed probe transversely attached to a cross member at a
distal end. A second probe transversely attached to a body member
proximate to the fixed probe, said body member and second probe slidaby
moveable along the axis of the cross member. A measurement device
attached to the body member and second probe for recording of the
diameter proportional to the degree of expansion of the fixed and second
probe within the barrel. A recoil means for expansion contained with the
cross member and attached to the body member coupled with the second
probe providing an expansion pressure between the probes for measurement
with the measuring device.