I have a GQ 600-RPS and I love it. It detects alpha, beta and gamma. Detection range is only a few inches, so you have to know what to look for. We take it o

I have a GQ 600-RPS and I love it. It detects alpha, beta and gamma. Detection range is only a few inches, so you have to know what to look for. We take it on family outings and search for uranium rocks.