Kelsey Cummings wrote:
Mark Cooper wrote:
I picked up a floating hydrometer and I'm wodering if they are affected by
barometric pressure? When I float it in RO water it reads 1.004. Since I'm
located in Iowa, which is above sea level a bit, will this affect the
reading a bit?

http://en.wikipedia.org/wiki/Elevator_paradox_(physics)

http://tinyurl.com/nelfm

That will work a bit better.

-K