I got this batch last year before I knew of MG but similar purposes, and just to get better control of time use (doesn't always work π ). Added the digital timer which does countdowns or just counts up from zero, for the times I need something that beeps. With the discussion here I got curious so I set the digital timer to 10 minutes, flipped the 10 minute sand clock. 10 minutes were indeed 10 minutes to the second. π