I own one, it's a $300 Gamma Spectrometer that fits in your pocket. Closest thing I own to a real life Tricorder. I've tested it out on a smoke detectors. Succ

I own one, it's a $300 Gamma Spectrometer that fits in your pocket. Closest thing I own to a real life Tricorder. I've tested it out on a smoke detectors. Successfully identified AM-231 and its decay chains from like a foot away. Tested it out on my dad's basement, and it was able to pick up the whole radon decay chain (Thorium, Polonium, Lead, etc.) It's not a laboratory grade tool. You can point it at radioactive stuff and the spectra lines up perfectly if you Google the charts. There is a community of folks who walk around with them to identify radioactive deposits. I own a GM counter and it's not even in the same league in sensitivity or capability, it would be like comparing a flip phone to a smartphone.