Just received the old laser power meter shown in the link. It's a United Detector Technology model 21-A, with a nixie tube display that still works. I know UDT started making meters in 1967, and I'm wondering when they might have made the switch to the 7-segment LEDs I see on another of these units I see now on Ebay-UK. Anyway, I can't wait to open it up and straighten the tubes!
http://www.ebay.com/itm/390364062527...9#ht_679wt_936