I agree with most that suggest that the cheap swing arm hydrometer is just fine.
A nice toy is the refractor, good bang for the buck as the price has fallen considerably in the last couple of years. Just make sure you get one with ATC.
As for the salinity monitor, they are very fickle to operate to calibrate and moreover just a very expensive piece of equipment for a measurement that is not required to be that precise. golden_eye on this board had a used one available recently if your interested you may wish to contact him.
JMHEO
Wendell
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