Many years ago, I bought calipers that came with a generic storage box.
For all those years, I wondered what was supposed to fit in the second compartment.
The Framework Screwdriver fits perfectly.
Thank you! 
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Where can I buy those calipers? Specifically want it for also the case. 
perfection
That depends on where you live. I bought mine on Amazon Germany.
The calipers and the box are generic Chinese brands. If you find calipers with colored rubber buttons, an arrow on top of the battery compartment*, and a storage box with a zigzag pattern, it’s probably the same. 
*Note: Some models have the battery compartment lid screwed on. Look for calipers where the lid slides to the side.
For example, this one looks identical: Amazon Germany
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Found a different one sold in Amazon US with a different name. I didn’t realize it was generic, lol. The case looks identical!
https://www.amazon.com/Electronic-Micrometer-Measurement-STEAD-FAST/dp/B09985QCL9
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