I've been in the land mobile business since the 70's. Most of the benches I've worked on have had Motorola, Singer, Cushman, IFR, and later HP service monitors. My benches are HP and I have some older Cushmans and Singers that still work. Nice pieces of equipment to get things done efficiently.
CB had an initial flurry of test sets made by Sencore, Hickok, B&K, Logimetrics, and Lampkin. There were a few others that were made for CB like Meguro and some garage operations. Unfortunately they were high in price and never delivered their return on investment for most shops. The B&K were probably the best known and reasonably priced and entered into the fray much earlier then the others as a dedicated set for only CB.
Some of these sets were efficient, some were literally Frankenstein messes like Hickok that looked impressive, but nightmares for shop service.
Oddly, the Hickok rack sets get premium prices intact by collectors. The B&K pairs have been so used and abused by generations, it's almost impossible to find a pair that hasn't been butchered.
There's still an allure to some to find pristine sets and like the antique radio folks, collecting an ensemble like the Hickok racks with a factory promotional material from the 70's and early 80's as a retro CB display is growing in collector circles.
Anyone care to vote for their favourites and what they have?
I'm happy with two HP's, an old Singer FM-10 with an AM plug-in and a BK 1040 panel. I have a 2040 in a box, but don't see the point in using it. Only the integral noise generator is an advantage in that unit that I have a Motorola unit that takes it's place for tuning real noise blankers.