I've tried a TV screen and 2 different PC monitors at 50hz and 60hz.
I gues they all have some very special anti judder magic.
Or my eyes are really bad at detecting judder.
Lol. The EASIEST way for you to test it is to compare 2 channels with scrolling text with and obviously with 2 different Hertz. I suggest you try SKY NEWS UK (not during commercials) and NEWSMAX. Compare the running text at the bottom of the screen and you will eventually see it 😉.