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Broken stopwatches? Answered

My science teacher gave me all these stopwatches she thinks are broken, and I'm pretty sure they are easily repaired. Two work, as seen in the picture. There are buttons missing, but I can make some or just combine them to make a few full stopwatches. Where should I begin attacking this, so as not to get a ton of batteries to find that a few really are fried? They use button cell batteries, not sure what type though. :S


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12 years ago

. The batteries in the working units are obviously OK. Use them to test the other units.