Quote: (Originally Posted by
depth)

This feature is avaliable on the Meg HUD.
On the Shearwater HUD, simply rotate the LED 90 degree so they point upward and you have the same.
When facing the diver, you could also see the reflection of the LED blinking off the mask.
I haven't had the need to double-check my buddy's PO2 unless in a dive course, then I just check from the handset or see from the reflection.