Read your SCUBA instruments, Part 1: SPG

Part 1 of this series, how to read your instruments. The SPG mostly used reactively by keeping an eye out for when you reach the minimum pressure you planned for. But what if there is a way to know what your SPG will say before you look at it?

Here you can see parts 2 and 3
Part 2: Compass - https://www.youtube.com/watch?v=ZME_DtfcQCk
Part 3: Computer of Bottomtimer - https://youtu.be/c560eMVDqXo

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