Don't gunson still sell the colour tune kit now. I remember at college using a motor scope of some sort, a dirty great big yellow box on wheels with a timing light and a 2 gas analyser.

Crypton I guess, then in m y last year they had a Sun MSA3000 (I think) which was a more modern crypton with a nicer tv screen to look at with some extra colours rather than green.

Now we have a Verus Pro or a pico. How technology moves on.

got to admit though, with them nice big machines rhey did look the part and expensive so must of impressed the customer.