That's pretty cool, in the scope itself! That's a powered scope though I guess. Would be cool as you'd never have to take your eye off the target.
The Accuracy 1st scope level isn't tritium per se, it accommodates for a tritium vial though. It works the same as the normal bubble level really, except with the ceramic egg instead of the bubble. They are pretty cool and very accurate.
Thanks for your words on my write up. I try to make them interesting and understandable.