The SOPpr-2A-2-010 model is a mechanical single-hand stopwatch of the 2d 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 balance components are shock-protected.
High measurement accuracy is ensured by a balance spring oscillation system that is usually used in pocket watches. A period of oscillation is 0.4 s. The stopwatch is started, stopped and reset by pressing the crown.