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Winter Altimeter 57mm - $600 (Boulder)
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Roughly half the price of a new instrument.
Developed especially for gliding, the 4 FGH 40 altimeter shows absolute altitude and relevant flight level within a range of 0 – 20,000′ or 0 – 10,000 m. The instrument works by measuring the static air pressure using an elastic diaphragm cell (aneroid cell). A rotary knob is provided for the Millibar or HG setting.
Altimeters measure static air pressure, which decreases with altitude. The pressure-sensitive measuring element is a diaphragm capsule from which the air has been removed (aneroid capsule), which reacts to the effect of changing air pressure as the aircraft changes altitude. Tempered, aged copper-beryllium diaphragms ensure highly accurate readings. Diaphragm movement is transmitted to the instrument pointers by a linkage and gearwheels – the whole is insensitive to shock and vibration. A bimetal link compensates for the effects of temperature change.
This 57 mm 4 FGH 40 model is the most popular Winter Altimeter in the USA.
Price includes shipping to US address.