Since the aneroid altimeter is based on barometric pressure, if you travel a far distance, for example, a 2-4 hour car ride to your trailhead, the pressure may be different in that area than it was when you left home, even if you are at the same elevation.Īlso, lets say you hiked up to Macey Lakes with beautiful weather and you checked the elevation before you went to bed that night. Using the Thommen Classic altimeter is pretty easy and similar to the Kestrel, but unlike a GPS, you need to periodically set the altitude based on the current location. In addition to its temperature measurement capability, anemometer for measuring wind speed and its ability to log measurements automatically, it also has a barometer and altimeter. I used it regularly until I bought a Kestrel 4000 Pocket Weather Tracker. It was particularly useful when wanting to find my location on a map to determine how far I was from our camping location in the mountains. Garmin GPS (Left), Thommen Altimeter (Center), Kestrel 4000 (Right) When I bought the Thommen I was really getting into backpacking with my sons and I always liked carrying my altimeter with me on our backpacking trips. 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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