For some reason my caliper did not feature a depth gauge so I made an “upgrade” myself. The design replaces the the battery cover and adds a guide for the “rod” the lug. As you can see in the pictures an optional small string can be attached to this guide so it is still possible to hang up the caliper to the wall etc. The design fits for my tool that can measure up to 157.5mm . Maybe it works for yours too. Please post a make if that's the case =)