Thc gadget or how do I determine?

Do I need some kind of gadget to determine the thc level of the plants? If not how can you tell please? Thanks much.

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i think most send a sample to a lab for testing, im guessing reliable test equiptment is pricey? i think thc level is just a number, theres other terpines & compounds that contribute to flavor/aroma/ & effects on your mind & body… but it would certainly be interesting to know when you finish a succsessful grow…