Parolles 15-Minute Hourglass, Yellow
Terrible! Do not buy. Mine broke in less then 5 minutes. The sand was not coming down so I tapped the bottom to get the sand going again and it broke. I have the 30 minute one, so far it has not broken but the glass seems to be thicker.
I use them in my classroom, this is the only one that has broken in less than five minutes! I have some that I have had for years! I am very disappointed.
January 9, 2013