I would really like to find out how much of a climb the various hills are on my routes. Most of them aren't real long - half mile or less for a lot of them, a couple a mile or so, and one goes on for 5 miles.
I know a GPS unit might have an altimeter based on satelite readings and others use a barometer. But GPS units are expensive and I really don't need anything but the altimeter.
There are also watches that give an altimeter function - I think all are based on barometric readings. Some of these include other bicycle computer functions (speed, odometer, etc). They seem to cost less, though some are pricey.
So, just how accurate are these various altimeters (plus/minus how many feet)? And are there any that people could recommend?