FIELD: measurement technology. SUBSTANCE: device includes measuring drum, drive, unit for reading and recording of information, mechanism of correction of results of current measurement by specified standard length. The latter has sector with limiter and impingement plate installed along movement of material;, pendulum and flag indicator. Pendulum and flange indicator are mounted in guiding groove for movement by means of interaction with moving magnet built-in body of measuring drive. Optoelectronic pickups determining standard length are located external to guiding groove of sector between impingement plate and limiter. EFFECT: simplified design, enhanced operational reliability of device. 3 dwg
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