First version of Combined Depth Gauge - New generatiof of capillary depth gauges.
US Patent # US 11525658 B2 Issued - 12/13/2022.
Dive computers are accurate to within one or two feet, however capillary gauges measure depth as "close enough". Alec shows the evolution of capillary depth gauges using Boyle's Law of pressure and volume.
The first dial gauges used bourdon tubes but still had a backup capillary gauge around the dial