BORECKI

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Randy;
I read your article on salinaty with great interest and found it enlightning. But there is a growing trend amoung aquarists (yours truly included) to use refractometers in place of swing arms or floats.
Would it be possable to do a follow up article aimed at that segment of the hobby as far as use and maintenence is concerened?
Boris.
 

95galReef

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Randy,

So can I use my Hanna TDS Meter to measure my salinity? what would the conversion be from PPM to PPT ? I read on another post that someone used a refractometer which put the salintiy at 1.025 and then put the TDS in the same water and it read about 457ppm. Does this sound about right?

-Tom-
 

randy holmes-farley

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Arlington, MA
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So can I use my Hanna TDS Meter to measure my salinity?

If it covers the appropriate range.
Many do not.

1 ppt (part per thousand) = 1000 ppm (parts per million)

Natural seawater with a sg of about 1.026 has S=35, or about 35 ppt (35,000 ppm). The unit that reads 457 ppm must be maxed out, and cannot read the higher ranges properly.

HOWEVER, there are a number of different ppt scales, which really screws things up calibration for use in seawater.
 

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