What's the difference between the right- and left-handed versions of the ASCENSION handled ascender?

To optimize the ergonomics of the ASCENSION ascender, Petzl developed two models: one for left-handed users, another for right-handed users.

The operating principle is identical for the right- and left-handed models.

If the notched cam can be worked with the right thumb, it's a right-handed model. If it can be worked with the left thumb, it's a left-handed model.

There are no specific rules for choosing between the two ascenders; it's up to each user to decide which feels best. Some users prefer using a left-handed ASCENSION for rope climbing, others prefer a right-handed model.