We have previously purchased other brands' large (6.5" x 3.25") 5 and 15 minute hourglasses to use with our children to help them mark time for assess tasks. They worked so well that we picked up a pair of these 30 and 45 minute timers. So far they seem to be fairly accurate and reliable. The only small downside I can say is that they are smaller than the description says. Instead of 6.3" x 3.4" they are actually 5" x 2.5". In the photo you can see the difference between one of these timers (yellow) and the one you bought before (blue). In case you are wondering, this is definitely NOT a deal breaker for us. They're still easy to see around the room and should help our kids keep track of TV and tablet time.
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