Reasonably accurate z axis zeroing, easy and cheap

I had one of those cheap gram scales I use for measuring silicone catalyst, the kind you find in a convenience store that sells items for tobacco use only. I measured the thickness with digi calipers which in my case was .825.

Using .001 i just lower the bit until it first takes the scale off 0. Then enter .825 in the jog distance and tap down once. Working great so far.