The SOPpr-2А-3-000 model is a mechanical single-hand stopwatch of the 3d accuracy class. It is designed to measure time intervals in minutes, seconds and fractions of a second. It is equipped with a 60-second sweep with the resolution of 0.2 s and a 30-minute register with the resolution of 1 min.
The movement is powered by a mainspring, has 15 ruby jewels, an anchor escapement, a balance spring and a period of oscillation of 0.4 s. The stopwatch is equipped with a single-action timing system. It is started, stopped and reset by pressing the crown. The power reserve for a fully wound stopwatch is not less than 18 hours.