Enhance measurement accuracy with this angle meter accessory. - Long distance timing made reliable: a cord can be used to fix a stopwatch over a hole in the instrument, keeping time aligned with measurements over extended distances. - Precise marking and setup: the apex of the angle meter allows placing a breakpoint or a pencil through one of its holes for repeatable alignment. - Easy course or bearing determination: read the length on the angle meter to determine course or bearing quickly. Function and compatibility - Function: supports fixed timing, marking, and bearing reading using the angle meter's hole system. - Compatibility: designed to work with standard angle meters or protractors that feature holes and an apex. - Performance: provides stable alignment for field or drafting use. Use scenarios - Field survey of a long straight segment, timing with a stopwatch while maintaining alignment. - Plotting bearings on a map or chart by marking through a hole. - Classroom or training exercises to practice determining course from protractor length readings.