On a thread a while back, somebody was asking how do you compare your watch to NIST time, so you know how it's running. Here's a way to do it with a number of watches at the same time. You need a tablet and a phone with a camera. On the tablet go to time.gov and leave that on the screen. Arrange your watches to be compared around the tablet, and take a picture. NIST time shows 1:10:42 From the left 1:10:53 +11s 1:10:17 -25s 1:11:12 +30s 1:10:47 +5s 1:10:37 -5s So, these are all set within +/- 30 seconds from NIST. In a day, or a week - always keeping them wound - I can do the same thing again, and see how far they've changed. This saves you trying to switch your eyes quickly from the watch to the screen and back. You can take the picture, and figure the variance at your leisure.