They are approximately 2" in diameter. Fairly compact, but easy to read. The compass works smoothly, too. I've been using it for about 5 years now with no issues or complaints.
Paul G Thanks Walter for the prompt reply. Are the gauges with the XS Scuba Pressure Gauge / Compass Combo about the same size? If so, are there any other features, other that the physical configuration, that would make either the XS Scuba Pressure Gauge / Compass Combo or SCA_240 preferrable?
WALTER H I can't quite tell from the photos as to whether one guage is larger than the other. They are probably about hte same size. It appears that the XS Combo is a front-to-back configuration. I deliberately stayed away from that style because I don't like to have to turn the console over to use the compass. I like it on the same side as the gauge. Much more convenient for me. But its your choice.