Dsmile2 Minute Sand Timer Plastic Hourglass for Games Classroom Home Office Kitchen Brush Teeth Use, Set of 20

I bought these to time players turns in a board game. Being aimed at adults, it was essential that each player has the same time. Although the times varied quite widely, I managed to find 9 of the 20 which were within a couple of seconds of 2 minutes so happy with that. However, giving stars for overall quality, I have to say that the rest were at least 10 seconds out, one way or another, hence 3 stars. And you cannot go by the amount of sand in each. One had double the sand of another, but ran out sooner. I assume that the neck was wider so sand ran through more quickly.