I just bought a stopwatch to time myself running. How do I use it?

Question edited for clarity.
Question moved from Cars and Trucks to model category.

Send it back to them and request a free repair. No one in their right mind tries to take apart an electronic stopwatch. It is a precision instrument. :>D

ULTRAK 495 - 100 Dual Split Memory Stopwatch

CEI-Ultrak https://cei-ultrak.com > products > ultrak-495-100-dua...

100 dual split recallable memory; Bottom row displays either running event time or running lap time; Memory recall during operation; Take splits during ...
US$57.95 · ‎In stock

See if the video is any help

https://www.google.com/search?q=ultrak+495+stopwatch+disassembly

..

You can do that if you have the "split" feature in your stopwatch. For example, if a runner is running an 800 meter race and you also want to measure how fast he runs the first 400 meters, you can click the split button after 400 meters. Then, you will have the runner's time for both the first 400 meters and for 800 meters.

Stopwatches are used at times when time needs to be measured precisely. For example, at sporting events like a running competition or swimming competition, stopwatches are used to measure the exact time of the race.

It's a good question - it really depends how seriously you want to take your running and what kind of running you are doing. Is it jogging for exercise, sprinting, marathon running? Check out this answer from running.lifetips which should help you figure out if you need to buy one. http://running.lifetips.com/faq/130138/0/should-i-buy-a-stopwatch-for-running/index.html

A basic stopwatch is pretty helpful when you're going for a run. It helps you keep track of your endurance progress in comparison to the distance you ran. I bought a simple 10$ stopwatch and it serves me pretty good for my running routine.

This is link is updated on Oct. 5, 2012

http://www.sportline.com/manuals/WV2787BK.pdf

"iPod Software 1.0 for iPod nano introduces a Stopwatch feature. You can use the Stopwatch as you exercise to track your overall time and, if you're running on a track, your lap times too. The Stopwatch menu is located in the Extras menu. To access the Stopwatch from the main menu, select Extras, then Stopwatch, and then Timer (Extras > Stopwatch > Timer) to see its display. Total time of session Current lap time Left button (Start function shown)1 Battery indicator Right button (Clear function shown)1 The left and right buttons' names and functions will change, depending on the current state of the Stopwatch. Using the Stopwatch When you first enter the Stopwatch screen, the left button is labeled Start and the right button is labeled Clear. To use the Stopwatch, select the Start button (use the Click Wheel to highlight the Start button, then press the Center button). The Stopwatch creates a new session, and both the total time of the session and the current lap time begin counting: When these counters begin, the left button changes to Pause and the right button changes to Lap: If you select the Lap button, the current lap time will be recorded in the session's log, then the Stopwatch resets the lap time to zero and begins counting the new lap's time. The total time of the session will freeze for 5 seconds after you select the Lap button so you can quickly view your total time at the end of that lap. After 5 seconds, the total time of the session displays the correct total time and resumes counting. If you select the Pause button, both timers will stop counting and the left and right buttons will change to Resume and Done, respectively. If you select Resume, both timers will begin counting again. If you select Done, the Stopwatch records all the final times and creates statistics for your session in a log. Please note that selecting the Done button does not reset the display. You will see the final times for your total time and lap time displayed: To reset the display, select the Clear button (appears after you click Done and then select Timer again). Stopwatch Behaviors You can play music and use the Stopwatch at the same time. When iPod nano displays the Stopwatch screen, the Play/Pause, Next/Fast-forward, and Previous/Rewind buttons control music playback as usual. If you're playing music, you'll see an icon in the upper-left corner of the Stopwatch screen that indicates the current playback state: A play icon indicates that music is currently playing. A pause icon indicates that a song is currently paused. You can use the Menu button and the Click Wheel to navigate to other menus without interrupting the Stopwatch. Note: The Stopwatch will prevent your iPod from sleeping if it's counting. The Stopwatch will automatically stop if any of these three conditions are met: The total time counter reaches 24 hours iPod goes into hibernation (you can start it again when you wake iPod) You conne

"iPod Software 1.0 for iPod nano introduces a Stopwatch feature. You can use the Stopwatch as you exercise to track your overall time and, if you're running on a track, your lap times too. The Stopwatch menu is located in the Extras menu. To access the Stopwatch from the main menu, select Extras, then Stopwatch, and then Timer (Extras > Stopwatch > Timer) to see its display. Total time of session Current lap time Left button (Start function shown)1 Battery indicator Right button (Clear function shown)1 The left and right buttons' names and functions will change, depending on the current state of the Stopwatch. Using the Stopwatch When you first enter the Stopwatch screen, the left button is labeled Start and the right button is labeled Clear. To use the Stopwatch, select the Start button (use the Click Wheel to highlight the Start button, then press the Center button). The Stopwatch creates a new session, and both the total time of the session and the current lap time begin counting: When these counters begin, the left button changes to Pause and the right button changes to Lap: If you select the Lap button, the current lap time will be recorded in the session's log, then the Stopwatch resets the lap time to zero and begins counting the new lap's time. The total time of the session will freeze for 5 seconds after you select the Lap button so you can quickly view your total time at the end of that lap. After 5 seconds, the total time of the session displays the correct total time and resumes counting. If you select the Pause button, both timers will stop counting and the left and right buttons will change to Resume and Done, respectively. If you select Resume, both timers will begin counting again. If you select Done, the Stopwatch records all the final times and creates statistics for your session in a log. Please note that selecting the Done button does not reset the display. You will see the final times for your total time and lap time displayed: To reset the display, select the Clear button (appears after you click Done and then select Timer again). Stopwatch Behaviors You can play music and use the Stopwatch at the same time. When iPod nano displays the Stopwatch screen, the Play/Pause, Next/Fast-forward, and Previous/Rewind buttons control music playback as usual. If you're playing music, you'll see an icon in the upper-left corner of the Stopwatch screen that indicates the current playback state: A play icon indicates that music is currently playing. A pause icon indicates that a song is currently paused. You can use the Menu button and the Click Wheel to navigate to other menus without interrupting the Stopwatch. Note: The Stopwatch will prevent your iPod from sleeping if it's counting. The Stopwatch will automatically stop if any of these three conditions are met: The total time counter reaches 24 hours iPod goes into hibernation (you can start it again when you wake iPod) You conne

"iPod Software 1.0 for iPod nano introduces a Stopwatch feature. You can use the Stopwatch as you exercise to track your overall time and, if you're running on a track, your lap times too. The Stopwatch menu is located in the Extras menu. To access the Stopwatch from the main menu, select Extras, then Stopwatch, and then Timer (Extras > Stopwatch > Timer) to see its display. Total time of session Current lap time Left button (Start function shown)1 Battery indicator Right button (Clear function shown)1 The left and right buttons' names and functions will change, depending on the current state of the Stopwatch. Using the Stopwatch When you first enter the Stopwatch screen, the left button is labeled Start and the right button is labeled Clear. To use the Stopwatch, select the Start button (use the Click Wheel to highlight the Start button, then press the Center button). The Stopwatch creates a new session, and both the total time of the session and the current lap time begin counting: When these counters begin, the left button changes to Pause and the right button changes to Lap: If you select the Lap button, the current lap time will be recorded in the session's log, then the Stopwatch resets the lap time to zero and begins counting the new lap's time. The total time of the session will freeze for 5 seconds after you select the Lap button so you can quickly view your total time at the end of that lap. After 5 seconds, the total time of the session displays the correct total time and resumes counting. If you select the Pause button, both timers will stop counting and the left and right buttons will change to Resume and Done, respectively. If you select Resume, both timers will begin counting again. If you select Done, the Stopwatch records all the final times and creates statistics for your session in a log. Please note that selecting the Done button does not reset the display. You will see the final times for your total time and lap time displayed: To reset the display, select the Clear button (appears after you click Done and then select Timer again). Stopwatch Behaviors You can play music and use the Stopwatch at the same time. When iPod nano displays the Stopwatch screen, the Play/Pause, Next/Fast-forward, and Previous/Rewind buttons control music playback as usual. If you're playing music, you'll see an icon in the upper-left corner of the Stopwatch screen that indicates the current playback state: A play icon indicates that music is currently playing. A pause icon indicates that a song is currently paused. You can use the Menu button and the Click Wheel to navigate to other menus without interrupting the Stopwatch. Note: The Stopwatch will prevent your iPod from sleeping if it's counting. The Stopwatch will automatically stop if any of these three conditions are met: The total time counter reaches 24 hours iPod goes into hibernation (you can start it again when you wake iPod) You conne

"iPod Software 1.0 for iPod nano introduces a Stopwatch feature. You can use the Stopwatch as you exercise to track your overall time and, if you're running on a track, your lap times too. The Stopwatch menu is located in the Extras menu. To access the Stopwatch from the main menu, select Extras, then Stopwatch, and then Timer (Extras > Stopwatch > Timer) to see its display. Total time of session Current lap time Left button (Start function shown)1 Battery indicator Right button (Clear function shown)1 The left and right buttons' names and functions will change, depending on the current state of the Stopwatch. Using the Stopwatch When you first enter the Stopwatch screen, the left button is labeled Start and the right button is labeled Clear. To use the Stopwatch, select the Start button (use the Click Wheel to highlight the Start button, then press the Center button). The Stopwatch creates a new session, and both the total time of the session and the current lap time begin counting: When these counters begin, the left button changes to Pause and the right button changes to Lap: If you select the Lap button, the current lap time will be recorded in the session's log, then the Stopwatch resets the lap time to zero and begins counting the new lap's time. The total time of the session will freeze for 5 seconds after you select the Lap button so you can quickly view your total time at the end of that lap. After 5 seconds, the total time of the session displays the correct total time and resumes counting. If you select the Pause button, both timers will stop counting and the left and right buttons will change to Resume and Done, respectively. If you select Resume, both timers will begin counting again. If you select Done, the Stopwatch records all the final times and creates statistics for your session in a log. Please note that selecting the Done button does not reset the display. You will see the final times for your total time and lap time displayed: To reset the display, select the Clear button (appears after you click Done and then select Timer again). Stopwatch Behaviors You can play music and use the Stopwatch at the same time. When iPod nano displays the Stopwatch screen, the Play/Pause, Next/Fast-forward, and Previous/Rewind buttons control music playback as usual. If you're playing music, you'll see an icon in the upper-left corner of the Stopwatch screen that indicates the current playback state: A play icon indicates that music is currently playing. A pause icon indicates that a song is currently paused. You can use the Menu button and the Click Wheel to navigate to other menus without interrupting the Stopwatch. Note: The Stopwatch will prevent your iPod from sleeping if it's counting. The Stopwatch will automatically stop if any of these three conditions are met: The total time counter reaches 24 hours iPod goes into hibernation (you can start it again when you wake iPod) You conne