Honestly it doesn’t really hold that much importance.
Callipers can be hand to just measure your sum of skinfold. If that goes down then your bf% will have decreased. As long as it’s always the same person measuring in the same spots that will reduce the user error also.
I’m assuming you just want a low body fat percentage right?
I’m pretty lean all the time, I can see all my abs, my obliques and have good arm vascularity. I’ve not checked my bf% in years. If people said it was 8 or 10 or 12 or 16 it wouldn’t matter.
If you read through these forums you’ll see tonnes of opinions etc however I’ll give you the summary.
Essentially all the experienced bodybuilders/strongmen/powerlifters and recreational lifters on this site will tell you that the number is irrelevant. If you want to have less fat then lose weight, if you want to build muscle then gain weight slowly.
That’s the secret sauce.