Gridfinity base for OWON XDM1041 and XDM1241 benchtop multimeters

The OWON benchtop meters XDM1041 and XDM1241 are both nice units for benchtop work but could use some gridfinity lovin' so here we are.

This model should fit the meter tightly such that it won't just lift out of place.  To insert, start with the front edge tilted into the printed model, then pivot the back down and press into place to hold it securely.  To remove, reverse the process.