This is a versatile adapter to fit on (almost) any 2-meter folding meter.
It allows to do insider/ internal measurement.
Place the adapter on the meter and shift it up to the point to "fill" the inside dimension of the object to be measured. Fix the adapter with the tightening feature, retract from the measured object, unfold the meter and take the reading.
My first parts doen in PETG.
Monoprice Maker Pro 10 Mini
DAS FILAMEN PETG, PLA
I used PETG for the first time on the main (yellow) and externder (natural/ transparent) part.
The knob was done in PLA.
I printed the main part with support and the round shaped cut faxing the printer bed. If I had to print it a second time, I'd consider doing it upside down with a constructional redesign around the area where the flexing tightener is located (making it level with the top surface).
The extender part was printed with the flat side facing the printer bed.
The knob can be found here https://www.thingiverse.com/thing:3782750 (or amongst my other things).