I know Mark the try to BS you. There is only one company in the world that I
know of that
sells a refract calibrated to NSW, for the tune of about $600. You have the most
common
refract there is in this hobby, it is made in China the RHS-10ATC . Here is the
real
maker.
http://www.instrument-china.com/index.htm This page has an error so click on
RHS-10,
which has both.
Although many of the companies that make these may say what you posted it is BS.
They are
calibrated from the factory and you can't calibrate a refract to sodium chloride
salinity
and NSW salinity at the same time, as NSW has a higher RI (Refractive Index).
These
companies are also not going to be giving you seawater NIST STD, which cost more
than your
refract by a factor of over 5. :-)
--
Boomer
Want to talk chemistry ? The Reef Chemistry Forum
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WCWing@nospamChartermi.Net
Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS
If You See Me Running You Better Catch-Up
: Thanks,
:
: The pre-amble on mine says "is used in oceanography and seawater studies"
: but then it also says "In the food industry it is especialy effective in the
: preparation of frozen vegitables, fruits, seafood and ocean byproducts" - so
: I suppose it is anyones guess, although 'oceanography sand seawater studies'
: sounds promising!
:
: Mark
:
: Posted Via Usenet.com Premium Usenet Newsgroup Services
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Posted by on May 13, 2005, 1:34 pm
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Thanks, that's useful. More compensation required!
I currently use many brands of salinity meters. The best one so far is the
refractometer. The plastic units should all be calibrated against a good
quality refractometer or a nice glass floating hydrometer. I have not sold
or used one yet that wasn't off just a little. By a little i mean .001-.003.
I have seen some over the years that were really off. !!
Posted by on May 10, 2005, 4:27 pm
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I calibrate mine using distilled water (obviously to 1.000). Are you saying
that there is an anomoly (above the quoted + or - 0.001 accuracy) after
calibration when you measure seawater?
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