Well Robert, that old Macbeth sold for $41 actually. I know since I bought it. The way I figured I couldn't loose. The seller says it is functional. If the lamp is bad that can be replaced. Calibration should be easy enough. Minor repairs to things like switches or power supply I can do myself. The only killer would be a failure of the detector which would probably mean the junk heap. But for $41 it seemed like a reasonable thing to try.