no body is 3%
if there are, then they are dead
The one standard of measurement that all bodybuilders have used throughout history from Arnolds era till now is the calipers. I think it is the only true way to measure a physique because of 2 reasons;
1. after the muscle is the skin, in between is fat and water. The less fat and water one has the more define they look, pretty simple.
Now when you pinch the skin you are not only pinching the skin, you are pinching the fat and water that come after the muscle so the less you read on the calipers the more shredded you look no matter what, so regardless if it is accurate or not because it does not include the fat in your organs and what not, it is still a very consistent way among individuals.
2. When you test your fat you should choose the standard method so you have a bench mark to compare to, so caliper is the only meaningful way to test because then you can compare to all bodybuilders that have ever used this method, which would be the norm.
Now having said that, I measured in at 3% body fat in this pic on this day using the calipers. 5'9 in the pic and weighed 184 lb. I remember that the thickness of my skin was the same as my eye lids on every body part from thighs to love handles, the depth of my eye lids.
Notice you can see the striations on my glutes and I am not flexing my glutes at all.