Shahe caliper box.
I bought it on aliexpress and I was surprised by the quality of this caliper, I recommend it!

It contains a space for 3v batteries, and a second space to store a microfiber cloth for cleaning.

The box is also used for other calipers, you just need to analyze your case.

2 neodymium 5x3.6x2 mm

2 screws M6 x 30mm
2 M6 nuts

Hope you like it! :D