I personally use one of those rotary style shavers with the three, articulating blades. You can really press hard and get a very close shave with it to where even with sandpaper stubble like mine, you’re smooth as butter.

The disadvantage is it isn’t precise, so you’re not going to want to get close to anything complex that sticks out like genitals or a nose, but it’s plenty good enough for a jaw/chin.