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MoHMA Stethometer, Carrols 3.5" stainless steel piece with small handle on each end and an inset, which slides. Inset has a loop for measuring tape which also goes through a double arm at other end. The outer piece is calibrated allowing measure of changing length of the cotton tape to measure excursion of the chest. https://www.mohma.org/instruments/category/pulmonary/stethometer_carrols/