I love the tCheck! It was a toss-up between MyDX and the tCheck and I'm glad I chose the tCheck. It's easy to use, gives me the results I need, and customer service is great and always there to help. At first, I had a little trouble with getting within the range and how the dilution ratios worked (math is not my strong suit) but I reached out to customer service and they quickly helped me figure what I was doing wrong and I've had no issues since then! Turns out my stuff was stronger than I thought it was
Just remember: we're dealing with a plant. No two buds or representative samples from the same plant are going to yield the same results in terms of thc/cbd concentration. It's coming from a living thing. It should always be considered a ball park estimate, regardless of whether its coming from a lab or a hand held device.