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Stopwatch - mechanical, one-hand, with a simple-action mechanism for controlling the hands, with interrupted operation of the clock mechanism, designed to measure time intervals in minutes, seconds and fractions of a second. Has a shockproof Balance protection and is used in sports competitions, scientific research, timing. 
Stopwatches are issued on the basis of the certificate of type approval of measuring instruments RU.C.33.059.A No. 42780, valid until April 22, 2021. 
The stopwatch has a 60-second scale with a division of 0.2 s and a 30-minute counter with a division of 1 minute. 
Mechanism of 42 mm caliber, on 15 ruby ​​stones, has a spring motor, an anchor stroke and an oscillating balance system - a spiral with an oscillation period of 0.4 s. 
To control the hands, the stopwatch mechanism is equipped with a special single-action lever device. Start, stop and return of hands to zero are carried out by successive pressing of the crown. 
The duration of the movement from one full spring winding is not less than 18 hours. 
The dial is covered with white enamel, the numbers and hands are black. 
Accuracy class 2.
Permissible error for 30 min, s ± 1.0
Operating temperature range, ° C -20 ... + 40
Overall dimensions (no more than), mm d50x18x70.
Weight 0.09kg
Shock-proof mechanism of the balance unit.
Metal body, chrome-plated.

Verification frequency - 1 year.