A 3x3 Gridfinity holder for the GT2 Belt Tension Meter (RC2) by PF Makes / Diyshift
Holds both the belt tension meter and the calibration holder/piano wire
The actual tool can be found here:
https://github.com/Diyshift/3D-Printer/tree/main/GT2%20Belt%20Tension%20Meter
The author marked this model as their own original creation.