Skulpt is pretty good. I tested it against a pro caliper test (she knew her stuff) and on two different occasions the readings between the Skulpt and 7 point caliper test were about 0.5%.
My Sklupt has been showing steady decline in my body fat percentage that's also obvious when I look in the mirror. My true measure of how lean I am is looking at the two big veins that travel upward from the pelvic area into my navel area fat mound. The more I can see of those veins, the leaner I now I'm getting. What's great about this summer cycle is that my weight has been hovering in a range between 170 and 174 while I'm getting more ripped every week. I'm going to get a thread going soon laying out what I've been doing and some tips.
I would say don't worry about the number. Find a landmark on your body (like a cluster of veins around the hip area) and use that as your guide. When you're getting lean, you should look veiny as fuck. There's no one I can think of with a sub 10% BF percentage who isn't looking like a walking roadmap.
My Skulpt is saying 9%, but I think I look leaner than that. I talk to people in the gym who think they're 8% and they don't even have a single vein showing anywhere so that goes to show the warped perception people have about body fat. The number is always higher than you think.