Wm. B. Johnson GSM-500 Survey meter Geiger counter radiation with pancake probe - $295 - (St. John, KS)
Nice survey meter, GSM-500. Auto-ranging for both CPM and Dose rate. Speaker works and all other functions work. Has a Wm. B Johnson pancake probe that detects Alpha, Beta, Gamma and X-Ray radiation. My pictures don't show the red light below the multiplier scale very good but they all work. Pictures show its condition and it detecting an old clock dial on X 10 and X 100 ranges. Also shown is it detecting an Alpha source on the X 100 range. As I said the range lights light up but they didn't show up very well in my pics. The unit had some minor battery corrosion that I got cleaned up pretty good. It wasn't much and didn't damage anything. It uses 6 "AA" batteries (not included). Light weight and very portable. Will ship in USPS Priority mail medium flat-rate box for 2 to 3 day delivery time. Any questions please ask. (Had this item up before but a person wanted to buy just the probe so I ended it...he never did buy it so I'm relisting the complete unit.)
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From ebay.com - 1 month ago