PADI standards do not allow teaching of any PADI course whilst using a CCR.
You can teach ConEd courses using a SCR (Dolphin or Ray - they are the ones PADI have courses for).
I'm with Thal, generally I am using something that is close to what the students are using. HTere are exceptions - wreck courses I wear my twinset, but it is at least recognisable and I can fully justify to the students why each and every bit of the kit is appropriate.
You can teach ConEd courses using a SCR (Dolphin or Ray - they are the ones PADI have courses for).
I'm with Thal, generally I am using something that is close to what the students are using. HTere are exceptions - wreck courses I wear my twinset, but it is at least recognisable and I can fully justify to the students why each and every bit of the kit is appropriate.