Review on Hourglass Yueton Sandglass Management Intensity by Travis Kjar

30 seconds, 1 minute and 2 minutes are mostly accurate. The 3 minute timer is 2:45, the 5 minute timer is 4:40 and the 10 minute timer is 11:51. We use them to give our daughter a visual timer for sleep, dinner, and other things. Therefore, minor deviations are not a problem. They work and look like they won't break if little kids throw them around. I'm sure if stepped on they would break or be chewed by a dog.