Well,
Similar commercial Radarrange units show up frequently in the 40-60 dollar range at auctions and larger flea markets around Wyoming and Colorado.
My personal experience with them was great, very fast and the programmed settings useful. Still, they take an awful lot of abuse (not all are used in kitchens, many are put next to vending machines in prisons and dorms) and require 20Amp circuits (with the required socket which is not the same as the 'standard' American.)
I'd take it if you want it, and feel they really did only use it for themselves. Might get a cheap radiation checker and test, too.