Stainless steel Martin pelvimeter with measures up to 45cm. Three major constituent parts make up the instrument, two detachable blades and an arc for reading measurements (in centimeters). Each blade is bowed outward and has a large opening slat in the middle for the insertion and free movement of the arc-shaped measurement scale. There is a small bulbed ending at the distal end of each blade. A screw connects the measurement arc to the blade.
Diagnostic Techniques, Obstetrical and Gynecological -- instrumentation