I use the Drs one and I too use the pinpoint solution to calibrate it.
Because it's calibrate to a 35 ppt standard and I run my tanks at 35 ppt it's dead accurate. what more could you want?
I bought one on ebay for $21, calibrated it with pinpoint cal solution and it was dead on. As far as durability goes, I can't say, as I've only had it about a month, but it seems like a nice quality instrument.
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