1. before use must carry out the test table, mainly to see whether the key is a problem, whether the time of the record is accurate.
2., joint or second knuckle of the index finger with the thumb button button, the stopwatch and against his chest, the key is not in complete swing arm in any action.
The 3. key is to use the right angle and the right force as far as possible. Do not press the edge or angle of the button to avoid the button to hold or damage.
4., do not run the stopwatch on your neck or put it in your pocket when the timer is open, prevent the stopwatch button from colliding with your body during the run, resulting in an unexpected stop or opening.
The 5. table to switch attention to smoke signals, and the end point of straight line stopwatch, not inclined to see.
6. keep regular replacement of the battery, usually change when the display is darkening, do not wait for the battery to replace the electronic stopwatch.
7. electronic stopwatch is normally placed in a dry and safe environment, so as to prevent moisture, shock, corrosion, fire and other work.
8. avoid placing items on an electronic stopwatch.
9. unsure of the situation, do not freely open private maintenance, should be sent to professional maintenance.