This is a split gridfinity holder that can hold these cheap chinese 6 inch calipers. I'm sure other cheap chinese calipers can fit in it as well. It has 6 battery slots. It also features a couple other holes for things that I had in my drawer. I've included the freecad save files if you want to edit it.

I split it so that I could fit it on a ender3's bed. I recommend printing with a raft or a brim as there are a couple parts with a very small foot. If these feet do come unstuck, you can keep the print as they are not strictly necessary.