Ball M-19 Vario-Altimeter
Vintage Ball instrument used in paragliding. A true collector's item. Still fully functional. Tells altitude above sea level and A2 can be zeroed to tell you altitude above launch or your LZ. Vario tells rate of climb and rate of sink with both visual and audio. Will record 7 flights. Max rate of climb and sink. Will record max altitude both A1 and A2. Plus time of each flight and a total cumulative time.
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How similar is the M-20 to this? What were the differences? Do you remember? Someone is sending/giving me a working M-20, but I can't find a picture or information on it anywhere on the net. Uses a 9volt battery, leg mount like this one. Aka, "Parking Meters"