FIELD: geodetic instrumentation. SUBSTANCE: invention can be used in range line observation and for high-precision angular and linear measurements. Measuring mark to finder system has body with unit changing width of lines of raster and sight, carriage and interval indicators. Unit is manufactured in the form of parallel guides with screw thread and is linked to handle. Lines of raster come in the form of alternating dark and light plates anchored on carriages. Carriages are installed in guides for movement. Each carriage is joined by two nuts with the help of holders. Thread in guides is left-hand on one part and right-hand on the other part. Pitch of thread between guides change by constant value. EFFECT: expanded range of application of measuring mark, raised sighting precision and labor productivity. 3 dwg, 1 tbl
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