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The tendency is the most important aspect of an aneroid barometer. I have this one

What the tendency tells you is wheather or not you have wind..and wind is what it is about to us sailors...A sharp rising tendency means High Pressure is ridging in and the winds will be howling:) If the tendency is to drop then a storm or low pressure is headed your way and the winds will increase followed by storms...When the pressure is steady you will notice calm conditions...
As far as their accuracy right now my digital reading on my Davis weather station is 30.37 inches or 1028mbs the analog reads 30.32 inches so you can see they are pretty accurate just a little slower to respond:)..My barometers are calibrated at sea level but if I went to a lake over 4000ft in altitude the readings would be way off where they should be BUT the tendency would be the same...Hope this helps..
 
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