The reason for some is as stated in Pzemol's post ( he also posted on care of swing-arms).
I have a $600.00 conductivity meter and still used the swing arm. The are very fast and
easy to use, especially when you have been using them for decades. Many reefers often use
a refract or conductivity meter, just so they can compare it to their swing-arm and use
it.

--
Boomer

If You See Me Running You Better Catch-Up

Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

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"Cindy" wrote in message
.net...
: Boomer wrote:
: and Wayne is correct or with standards and here is a link
:
:
: Reef Aquarium Salinity: Homemade Calibration Standards
: http://reefkeeping.com/issues/2004-06/rhf/index.htm
:
:
: Well thank you, cause if I had a refractometer, I wouldn't need to
: calibrate the Seatest. Guess I should have asked the question better.
: Or Googled.