Cindy wrote:
I have a new Coralife Deep Six hydrometer that I've been using for
the past year or so. But over the weekend I sorted through my trash can
full of aquarium supplies, and found my old "The Original" Seatest
hydrometer that I've had for probably 20 years.
The Coralife reads 1.022, and the tank has been doing fine.
The Seatest reads off the scale, well above 1.027! It's pretty
simple, I don't see how it could have gotten screwed up sitting in a
box? And my tanks did fine 20 years ago too.
I'm going to take them both to the fish store and see what they say,
but which one do I believe?

Cindy
To be honest. If you want to know the exact salinity, don't believe
either one. Swing arm hydrometers are not known for being accurate, but
they are pretty repeatable. The most important thing is that you keep
the salinity stable, not that it is exactly 1.025. The best thing is to
invest in a refractometer. They are much more accurate and actually
easy to use also.

Kim