Robuta

https://www.microcenter.com/product/661751/leo-sales-ltd-3d-printing-digital-caliper?rf=Add-Ons%3E3D+Printer+Accessories%3E

https://www.leevalley.com/en-gb/shop/tools/hand-tools/marking-and-measuring/calipers/111675-direct-reading-digital-inside-caliper