FIELD: measurement technology, measurement of linearity (bending) of axis of cylindrical hole of long pipes of small diameter. SUBSTANCE: measurements are conducted from theoretical, i.e. ideally straight, axis of hole. Case of device is made with two self-centering supports placed at preset base distance. Each support is manufacture so that sets case of device precisely to center of hole in section where it is. In this case line connecting centers of self-centering supports is theoretical (ideal) axis of measured cylindrical hole. Converter installed in case measured deviation of actual axis of hole from ideal one. Device is also provided with telescopic handle. EFFECT: provision for accurate measurement of linearity of axis of cylindrical holes. 4 cl, 2 dwg
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