Stopwatch are two main types of machinery and electronic, electronic watch and can be divided into two categories, three buttons and four buttons.Now most of the physical education teachers use more is electronic stopwatch.
stopwatch are two main types of machinery and electronic, electronic watch and can be divided into two categories, three buttons and four buttons.Now most of the physical education teachers use more is electronic, mechanicalin many places have become a thing of the past.Electronicis a kind of advanced electronic timers, electronicis commonly used at present domestic oscillation frequency of the quartz oscillator as a time reference, adopt six LCD digital display, display intuitive, easy to read, function more advantages.
Stopwatch readings of:
The circle for seconds, for small coil.If the circle is 30 points (top write of is 30, may have 60, show that precision to half a second), small circles one minute is divided into two small, read the complete part, if had a small, in the circle on the number of seconds to add half a minute, if not, directly read the number of seconds the circle.
Use stopwatch notice:
1, before using wind, but do not overtighten, so as not to damage the spring;Before use must check table, basically see button if there is a problem, whether record time.
2, when using, knuckles with your thumb or the index finger knuckles buckle buttons, and on his chest and is not in any swing arm action buttons.Don't too hard on table, in case of damaged parts.
3, After back to the table, such as the second hand is not null, should write down its numerical (zero reading), after test from measured value will be subtracted (note symbols);As far as possible when the keys in the right Angle and is suitable for power, not on the edge of the button or by oblique Angle, avoid jam or damage to the button.
4, don't putafter timing open running an hang around the neck or in your pocket, prevent run keys with the body in the process of collision, cause unexpected halt or open.
5, pay special attention to prevent breaks the, When not in use must put the stopwatchin storage box