For those that take SG readings...

[Slipgate]

So you adjust for sea level? Or are you just concerned with the before/after difference?

 

[s3n8]

Silver spring cant be more than a couple hundred feet above sea level... I would bet that the error from the calibration of your hydrometer contributes much more to the potential error due to elevation.

 

[jkarp]

A hydrometer actually measures the ratio of specific gravity refernced to water. It has nothing to do with pressure or pressure altitude. Now gravity is ever slightly less at elevation, but even brewing on Pikes Peak (14,110 ft), the difference would be invisible to the human eye on a hydrometer.

 

[Edcculus]

altitude has nothing to do with concentration of sugar in solution.

The biggest thing to watch for is making sure the liquid is at the correct temperature.

 

[Slipgate]

The directions for the hydrometer say something about subtraction x amount for something. Apparently I did not understand them.

 

[z987k]

you shouldn't subtract anything. You should take the reading and correct for however much you are off from it's calibrated temp.

 

[Laughing_Gnome_Invisible]

Bugger! Anyone want to buy a second hand altimeter?