TECHNOLOGIES AND EQUIPMENT
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Stopwatch SOS PR-2B


Quick Overview

Stopwatch mechanical SOS PR-2B is designed for measuring time in minutes, seconds and fractions of a second. It is also used in scientific research as well as in motion- and-time study.
  The mechanism of the 42-mm stopwatch on 16 ruby ​​stones has a spring-driven motor, an anchor escapement and a "balance-spiral" vibration system with a vibration period of 0.4 s.
  The operating period from one complete winding-up is no fewer than 18 hours.


Stopwatch mechanical SOS PR-2B is designed for measuring time in minutes, seconds and fractions of a second. It is also used in scientific research as well as in motion- and-time study.
  The mechanism of the 42-mm stopwatch on 16 ruby ​​stones has a spring-driven motor, an anchor escapement and a "balance-spiral" vibration system with a vibration period of 0.4 s.
  The operating period from one complete winding-up is no fewer than 18 hours.
  For controlling the indicating hands, the stopwatch mechanism is equipped with a special summation action device. Start, stop of the indicating hands is handled by pressing the crown, return to zero – by pressing the button.
   The stopwatch has a 60-second dial graduated in 0.2-second and a 60-minute counter graduated in 1 min.
   The case of the stopwatch is metallic, chrome-plated.

Model SOSpr-2б
Caliber of the mechanism, mm 42
Balance arrangement shockproof
Index line volume:
second, s
minute, min

0,2
1
Accuracy class 2
Permissible error in the crown position or the dial
up while measuring the time interval of 60 minutes:
at the temperature of 20 °C - within, s
within the operating temperature range of, s


± 1,8
± 5,4
Operating temperature range, °C -20...+40
Period of the stopwatch timing during continuous operation, hours 8
Term of energy autonomy, hours not less than 18
Overall dimensions, mm not more than 55 х 19 х 76
Weight of the stopwatch, kg not more than 0,15
Average total service life, years not less than 15
Content of precious metals: silver , g 0,045
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