Never replace batteries again! This solar powered stopwatch is accurate to 1/100 sec with lap/split control. Daily alarm, hourly chime, 12/24 hour display and full date functions included.

They can be used as timers, for instance to measure how long it takes to run from one side of the schoolyard to the other. It is a perfect resource during physical education. Stopwatches can also be used to let students understand how long one minute lasts. Let them guess when the minute is over and stop the time on the stopwatch. Was the guess accurate? Stopwatches are a must have in science labs to time physics and chemistry experiments. By using the timer function, it can give you accurate readings and time measurements. It can be used for any experiment where you want to measure the elapsed time. Or use the alarm setting if you want the experiment to finish after a certain amount of time.

Please note that the battery can be replaced with a L1154F.
 
WARNING!
Contains Button Battery
Keep new and used batteries away from children. Dispose of used batteries immediately. 
A Button battery can cause serious injuries if it is swallowed or placed inside any part of the body. 
If you think that batteries might have been swallowed or placed inside any part of the body, seek immediate medical attention.