stopwatch are two main types₽ $ of machinery and electronic, electronic ÷♠$€watch and can be divided into two categoriesε₹♦β, three buttons and four buttons. £♠δThe vast majority of PE teachers use more is elec•↕™tronic stopwatch, mechan∑±ical stopwatch in many places have beco÷₹me history. Electronicδπ♣ stopwatch is a kind of advanced ele±↓®λctronic timer, domesti₽÷→☆c electronic seconds are generally use the oscil↔≤↑lation frequency of t→∏he quartz oscillator as a time referen₹✘ce, adopt six LCD digital display, displ$₹‌ay intuitive, easy to read, fu↕↓σ®nction more advantages. The a ₩uthor talk about using and maintenanceβδ of electronic stopwatch time feel (in four key ↕✔λelectronic stopwatch as an example).

1. Record a time: in the case ofγ £ timer displays, press MODE key to choose, can a"ε₽ppear the stopwatch functio∞™©↔n. Press the START/STOP but∏∑ton to START automatic meσ→ter seconds, press the STOP meter seconds again, ✘≤₽show the meter data. LAP/RESET ↔≤button, then the automatic zero.

2. Record multiple time: if you want to record ≠‌✔ multiple objects at the same time,∞σ but don't reach the↓∏↓‌ finish line at the same tim‌ ↔e, the movement of timi™ ♥>ng function more ways ₹₽∑can be used (the specific n ‌umber of records to table the ins♦α>♠tructions). The first press START/STOP theק stopwatch conditions, a stopwatch to autoΩ™matic meter seconds, pr£‌Ωess the LAP to object to the finish/RESET,'‌ the number of seconds to STO×→•₽P according to different objects, and→¥¥ displayed on the screen above. The stopwatch₩∏• is still in the record, the internal cirβ↔"cuit continues to accumulat ≤​πe meter seconds behind the•≠ ₹ object. All objects record after✔←$∏ the completion of the normal STOP wat≥®♣≤ch, according to the RECALL  ε™can check in the previo€₩ us record, up-and-down ® available START/STOP and LAP/RESET button.

3. The adjustment of the time, date, t↓×Ωime and date of calibra'βαtion and adjustment if needed, can prε™πess MODE key, to display the digitaλαl meter seconds, minutes a←±σnd seconds, hold RECA★♥LL button for 2 seconds afπ£ ter see digital flicker can choose adjus≠✔↔®tment, until shows that need to ≤≠"∞be adjusted by the correct number of seco ←αnds, and then press the RECALL button.

Matters needing attention.

1. Keep the battery change regularl ♦♠φy, generally in display dimming ≠Ω® can be replaced, don't wait for the electr ©onic stopwatch to repla↓÷ce its battery runs out.

2. The electronic stopwatch §™₹placed at ordinary times, sa±↕₹fe environment to dry, moisture, sh≤φ€ock, anticorrosion, fire prevent∞>ion, etc.

3. Avoid putting stuff on the¥↔ electronic stopwatch.

4. Not sure of the situa≤∞©tion, don't open to repa≠∏ir, should send profession®✔∑al maintenance.