A depth gauge for measuring the depth of holes in bones or implants insertedwithin bones. The tool includes a probe with an abutment at its end to engageagainst the distal edge of the hole, a tubular body and a grooved insert.After the probe, slidably disposed within the tubular body, is positionedthrough the hole to be measured, the grooved insert is slid forward inside thetubular body. This pushes the probe sideward, towards the hole wall. Whenprobe and grooved insert are retracted together, they firmly engage againstthe distal bone wall with the abutment engaging the distal wall adjacent tothe hole. The tubular housing is then pushed forward until it abuts againstthe proximal bone wall, allowing, even in small diameter holes, an accuratereading of hole depth on the scale located at the rear end of the probe.
