Lighted Nock Sizing Question

[Band]

I've got my eye on some lighted nocks, specifically the Carbon Express Lauchpads.  I see the size will fit my arrows fine but I don't see anything to indicate whether they'll fit the diameter of my string.  How does one go about finding that out?

[Lowedog]

String fitment is basically standard.  Some fit tighter, some not so much. 

I bought some of the CE Launchpads to try out and found that they aren't very bright at all and the battery life is not good. 

[Band]

Really, not such a good choice, huh?  This guy puts them at the top of the list - https://stayhunting.com/best-lighted-nock-reviews/

Makes me wonder if he has a bias or something.