Holster for Commercial Electric OT-112R circuit tester

I inspect prefabricated equipment shelters designed to hold radio transmission equipment as a part of my job, and I use this circuit tester to confirm that all of the outlets are wired correctly. 

My problem is that if the tester falls to the bottom of my leather tool pouch, everything else has to come out before I can retrieve the tester.

My solution is this little holster which can clip to the the tool pouch, the tool belt, or my regular belt.

The bottom floor has a NEMA 5-15 dummy plug that the tester friction fits into to keep it from just falling out of the holster.

This prints fine without supports but a brim is recommended to prevent corner lifting. 

Most of these testers are about the same size so this may fit other models.

Link to the design on Tinkercad if you wish to tinker:

https://www.tinkercad.com/things/fwPBFfkFKgb