Daily Archives: August 12, 2016

Can you trust your sidemount SPGs?

SPGsDoes this sound familiar? You are getting ready for a sidemount dive. You are at the point where it is time to calculate your turnaround pressures. You look at your SPGs to see what your starting pressures are and are surprised to discover the starting pressures for each bottle are as much as ten percent apart — possibly more. What is going on here?