stopwatch are two ma© βφin types of machinery and elε✘ectronic, electronic watch and can be divide×→d into two categories, three buttons and fou↑σ✘ r buttons. The vast majority of PE teacher ™s use more is electronic™  stopwatch, mechanica÷ ‍πl stopwatch in many places have become history. $←✘ Electronic stopwatch is a Ω✘£kind of advanced electronic timer, domestic e±Ωlectronic seconds are generally use the oscill≈©®ation frequency of the quart←♥'≠z oscillator as a time reference, adopt s<♠ix LCD digital display, display ✘↑↕intuitive, easy to read, function more advan>♠↔tages. The author ta$£lk about using and maintenance of electron&αic stopwatch time feel (in four÷♣ key electronic stopwatc≤©h as an example).

1. Record a time: in the case₽≈¶ of timer displays, press MODE k×λ♣∏ey to choose, can appear the stopwatch fun €ction. Press the START/STOP button t©♥∞o START automatic meter secε÷onds, press the STOPΩ÷÷× meter seconds again, show the meter data←±. LAP/RESET button, then the ≥•Ωautomatic zero.

2. Record multiple time: if you♥¥₽♣ want to record multiple objec§₩β©ts at the same time, but don't r§©δeach the finish line at the same time, the movem≠∞×ent of timing function more ways can be used (the ≠§ specific number of records to table σ>  the instructions). Th¥​e first press START/STOP the sto"¥pwatch conditions, a stopwatch to automatic mete"βr seconds, press the LAP to object to "‌ the finish/RESET, the number of seconds toα₹£ STOP according to different objects, and displa↑©♠πyed on the screen above. The stopwatch is $£≠Ωstill in the record, the internal λσ€circuit continues to accumulate meter seconds ™→™behind the object. All objects record after the↑☆© completion of the normal STO©×∞ΩP watch, according to the RECALL can che±↑ck in the previous record, up- →and-down available START/STOP and LAP/RESET buttα on.

3. The adjustment of ≈₩₽the time, date, time and date of calibrat γion and adjustment if needed, can press MODE&×<β key, to display the digital mete ☆r seconds, minutes and seconds, hold RECALL buttπ•£ on for 2 seconds after see digital flicker can ch¶≤↔®oose adjustment, until sho✔Ω±ws that need to be adjusted by the correct n↕γumber of seconds, and then ♠₩×press the RECALL button.

Matters needing attention.

1. Keep the battery ch•↓πange regularly, generally in display dimminε g can be replaced, don't wait  ₽for the electronic stopwatch to replace its batγ'tery runs out.

2. The electronic stopwatch placed at ordi∏•‌nary times, safe environment to dry, m≥•↕£oisture, shock, anticorrosion, fire preventio★∑®αn, etc.

3. Avoid putting stuff on the $×electronic stopwatch.

4. Not sure of the situ♠↔®ation, don't open to re™✘✔↕pair, should send professional maintenanc‌★e.