Kelsey Cummings wrote in
:

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)

It shouldn't be affected suggesting that it is either miscalibrated or
that your RO water is rather "heavy." How about temperature?

-K


Cold water, right out of the holding tank.