RayFYou get one hand and two rotating disks, so it's a deal! But just one hand is enough for the time. It's easier to read than a two handed watch, when you think about it, from the perspective of a kid learning to tell time at least. The hand in the photo shows about 10:05. The ticks are for five minutes. If it's between ticks, it's, for instance about 10:05 or 10:09 if near the ticks, 10:06 or 10:08 if not centered but not near the ticks, and about 10:07 if centered between the ticks. The Mühle Glashutte einzeiger has double chapter rings, one like this one and and outside one giving ten- and two-minute ticks, but I don't think you really need that.
Einzeigers are called "slow time" watches or watches for people who don't need the exact time. But in reality what do you ever do where you need to know plus or minus five seconds the time rather than plus or minus one minute? I show up at piano lessons a few minutes early anyway. Who cares if it's three minutes or four minutes? Maybe for timing soft boiled eggs it's not ideal, but I have kitchen timers for that. But come to think of it, the kitchen timers are analog mechanical timers, so they are probably not much more accurate anyway, but I've been using them.