Hello everyone! I finished my 90%-er. Here’s the photo evidence:

Here’s the mockup of the top shell that I’m adding to the handheld EMI meter. There are no electronics in it, but after I added them it looked the same as this photo.

Using analogWrite to drive a current gauge. Gonna rebrand that thing as an EMI meter.

Turns out that taking probability class is very helpful, because I knew how to generate “random” pulses using the Arduino. Sounds great, very similar to Geiger counter’s actual clicking noise.

Full setup. I added this to the 3D printed shell and handle from above, and that’s what my 90% looks like!