Here's some cool advertising for old Triplett meters.
(http://www.obsoleteindustrial.com/photos/old-triplett-meters.jpg)
I'm not sure if any of these models are still in production, I would assume not too many, but it's still pretty cool.
(http://www.obsoleteindustrial.com/photos/triplett-meters.jpg)
They're showing multiple different meters in the ad:
Triplett 639-N, 630-T, 630-A, Model 630, 666-HH Pocket VOM, 625-NA, 630-PL, 666-R Pocket VOM, along with some VOM accessories.
This ad is from the late 50's early 60's.
Seems as though Triplett meters were always second to Simpson brand meters. However they worked just as well as far as I'm concerned.