THE ADVANTAGE OF PERMA-CAL DIRECT DRIVE GAUGES OVER CONVENTIONAL C-TUBE GAUGES IS SIMPLE....i.e ONLY ONE MOVING PART. NO GEARS, NO LINKAGES OR HAIR SPRING TO WEAR OR BREAK
THE ADVANTAGE OF PERMA-CAL DIRECT DRIVE GAUGES OVER CONVENTIONAL C-TUBE GAUGES IS SIMPLE....i.e ONLY ONE MOVING PART. NO GEARS, NO LINKAGES OR HAIR SPRING TO WEAR OR BREAK.