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VERTICAL SPEED INDICATOR/ 3 1/8 vertical speed rate of climb +/-0-6000' minimum. Dial has increasing/decreasing markings. Red Arc + 5000' TO -5000'. (REV. B). 8-310-61SVertical Speed Indicator | 3-1/8 in, ±6000 ftUMA's vertical speed indicators measure the change in static pressure due to a chan..