On the face it says 19 jewels and without taking it apart its difficult for me to imagine where they would be, but suffice it to say that a jeweled movement would lead me to believe that this altimeter will be working accurately for many decades. Thommen TX-16 has a 15,000 foot range My Thommen Classic is a TX-16 model, which has a range to 15,000 feet and good enough for any mountain in Colorado.Īs far as analog instruments go, its easy to read, and as you might expect, doesnt use a power source so, I never needed to worry about batteries going dead. In fact, most altimeters Ive seen also have inHg (inches of mercury), or mbar (millibar) markings for measuring barometric pressure. ![]() The barometric pressure change can be correlated to elevation change, therefore a barometer with a face showing feet or meters becomes an altimeter. ![]() If youve ever traveled from a low elevation to a higher elevation with something sealed, for example a bag of potato chips, you may have noticed that the bag expanded by quite a bit and sometimes looks like it is ready to burst It does this because barometric pressure changes with elevation and the pressure decreases as elevation increases. The Thommen Classic Altimeter Plus Barometer is an aneroid type. ![]() Thommen Altimeter Instructions Manual Very Readable.
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