Caliper Unreliability?

I just recently bought some electronic calipers, and im wondering if anyone might be able to share some experienced advice with me. I seem to be getting all kinds of variety in body fat, 12%-18% (im probably around 16% atm from my guesses and other calculations.).

Anyway, any advice on how much to pinch the skinfold? The instructions are way too brief, no details. Should i really tighten it, or just hold it loose? Or any other things i might be doing wrong that i don't even recognize myself lol...

I hope that makes sense, any advice would be great, thanks!
 
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