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An Altimeter

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Traditionally, an Altimeter, which works by measuring air pressure. Air pressure decreases as you get higher in a nice reliable linear fashion, so you can use air-pressure to measure altitude. You'll get errors with weather changes, like when that nice low pressure storm front rolls in, your mountain suddenly measures a few meters higher, but its good enough for general use.

And to be much more fashionable, you can use a GPS receiver. The Global Positioning System will tell you not only your latitude and longitude, but also your altitude. And its way more accurate than a traditional altimeter.
an altimeter

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Q: What instrument measures altitude?
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