Simple Gridfinity holder for a USB tester. It is 1x2 3U tall.

Tester can be found here https://www.amazon.com/Eversame-Multimeter-Voltmeter-Chargers-Banks-Clear/dp/B0BG1YRFKM/ref=sr_1_50?sr=8-50

All Gridfinity is made from Zack Freedmans original works. Check him out on Thangs and Youtube.

https://thangs.com/designer/ZackFreedman

https://www.youtube.com/@ZackFreedman