I saw this used by a YouTube personality. He trusts the results and so do I. I live in a new home with grass that wasn’t growing. The results show I’m missing some key nutrients but high in iron, probably right for my soil. I used this because it was tough to get to my state extension office. It was easy to order. Instructions were clear and didn’t ask for unnecessary information such as address, etc. just email. Results came back in about a week INCLUDING USPS mail time.”