[Precautions for using stopwatch] :

1.Before use, the meter must be checked, mainly to see whether there is a problem with the keys, whether the recorded time is accurate.

2.When using, use thumb knuckle or second knuckle of index finger to buckle the key, and hold the stopwatch against your chest, do not complete the key in any arm swing. Do not press the watch too hard, in case of damage to the machine;

3.After returning to the table, if the second hand does not mean zero, its value (zero reading) should be recorded and subtracted from the measured value (note the symbol) after the test; Press the button at the right Angle and with the right force. Do not press the button at the edge or at an oblique Angle to avoid getting stuck or damaging the button.

4.Do not hang the stopwatch around your neck or put it in your pocket to prevent the stopwatch from colliding with your body during running, which may cause accidental stop or opening.

5Pay attention to the opening of the watch to smoke as a signal, stop the watch and the finish line straight, not oblique.

[How the stopwatch reads] :

Big circle is second, small circle is minute. If the large circle is 30 minutes grid (the top is written 30, there may be 60 grids, indicating accuracy to half a second), a minute in the small circle is divided into two small grid, read the full minutes, if over a small grid, add half a minute to the large circle seconds, if not, directly read the large circle seconds.

[Precautions for maintenance] :

1. Keep the battery regularly replaced, generally in the display dimming can be replaced, do not wait for the battery of the electronic stopwatch to be replaced.

2. Electronic stopwatch at ordinary times to place the environment to dry, safe, do moisture-proof, shockproof, anti-corrosion, fire and other work.

3. Avoid placing items on electronic stopwatches.

4. Not sure of the situation, do not open private maintenance, should send professional maintenance.

[Stopwatch classification] :

Stopwatches are mainly mechanical and electronic two categories, electronic watches can be divided into three buttons and four buttons two categories. Now most of the physical education teachers use electronic stopwatch, mechanical stopwatch in many places has become a history. Electronic stopwatch is a more advanced electronic timer, at present the domestic electronic stopwatch is generally the use of quartz oscillator oscillation frequency as a time reference, the use of six liquid crystal digital display time, with the display intuitive, easy to read, the advantages of many functions.

[Electronic stopwatch operation demonstration] (see instructions) :

1. Record a time: in the case of timer display, press the MODE key to select, the stopwatch function will appear. Press the START/STOP button to START the automatic count, and then press the STOP count to display the counted data. Press the LAP/RESET button to RESET automatically.

2. Record multiple times: if you want to record the movement of multiple objects starting at the same time, but not at the same time to reach the destination, you can use the multi-timing function (the specific recordable quantity is subject to the specification of the table). That is, first, in the stopwatch state, press START/STOP to START the stopwatch automatically counts seconds. When the object arrives at the end point, press the LAP/RESET to display the count seconds of different objects to STOP and display them at the top of the screen. The stopwatch is still recording and the internal circuit continues to count the seconds for the object behind it. After all objects are recorded, STOP the table normally. Press RECALL to check the previous record. START/STOP and LAP/RESET can be used to scroll up and down.

3. Adjustment of time and date: if time and date correction and adjustment are needed, press the MODE key. When the counting number of hours, minutes and seconds is displayed, hold down the RECALL button for 2 seconds and the number flashes. Then you can select adjustment.