The TAT1M2 has a built-in strobe that when you press the “Lock” button (which actually unlocks the process) the strobe turns on and now you can use the + or – buttons. The strobe flashes along the spinning platter and you see lines that move faster or slower, just as if you have placed a strobe disc on the platter but again it’s built-into the outside of the platter. You hit the plus or neg button until the lines stop moving then you hit the Lock button whcih locks the speed in and there you have it. Simple, quick and efficient.
(Dealer disclaimer)