Turntable Speed


Hello Forum, I'm getting back into record listening after a long hiatus. Please forgive the naive question, but here it is.  My former 1981 turntable had a speed control with the little window where you could fine-tune the speed if it was a little off. I've noticed current turntables don't have that. Reasons?
Thank you. 
tgyeti
Turntable speed for me needs to be accurate enough to tune and play a guitar to.  If the band is playing in "E", I want to be able to tune my guitar (using a tuning fork) and solo along to that (given a modern recording where the band had the right pitch in the first place.)   My KAB strobe gets me there, although I acknowledge it's not 100% accurate.
Only product I know that's VERY accurate is the Timeline device. Don't know if it's still made.
https://youtu.be/RF2XieUlzvk
Timeline itself is accurate. The problem with it is that it relies on a human being to assess its accuracy by following a laser dot on a wall. Probably the timeline is better than the observers of the timeline.
I have a mint condition Yamaha P-550 turntable that I bought new in 1983 that also has the strobe light adjustment.  I had it completely serviced to set up a turntable system for my youngest son a couple of years ago, and it dials in the speed like butter now.  Very nice, low maintenance, budget turntable.