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never used one myself but it looks like a pretty good meter for a fair price. I've always trusted Hanna products for their dependability but I've learned to always keep your nice meters clean and calibrated with solution.
That actually isn't a Hanna product, it is an HM Digital. I have one of their tds pens (tds-3) and love it. You absolutely cannot beat the price and they come with a decent warranty, not that I've had to use it.