@BudLarfy Ya, I was a little surprised, they claim +/-3% like every cheap-ish digital meter I’ve seen. You can calibrate whatever offset you need in the phone app, at least w/ the blue-tooth models. If you find a good meter to test them against pls tag me up 
Thanks for popping in, I’ve been having some fun w/ this grow. I’ll take some spare luck if ya have it! 
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