Analog Altimeter THOMMEN TX-22

Thommen® TX 22 Mechanical Altimeter/ Barometers :
Pocket-sized and lightweight, these Thommen® mechanical altimeter/ barometers feature a 19 jeweled, temperature-compensated precision movement, aneroid capsules, scratch-resistant plastic faces, and extra tough Delrin plastic cases. All models include lanyard and multi-holder which attaches to any vertical or horizontal surface. No batteries required.
Altitude range: 0 to 6, 000m. Minimum accuracy: ± 10m. Minimum graduation: 10m. Temperature range: -20° C to + 40° C. Range: 735mbars to 1, 050mbars.