Which is not something on a lensometer that requires maintenance?

Question

Quizplus · Accepted Answer

There is no nose rest on a lensometer, therefore it does not need maintenance.
Periodically you should check the ink well to add more if necessary. The marker needle should also be cleaned off to avoid a buildup of excess ink.
All lensometers should also be cleaned and calibrated periodically by a professional to make sure they stay in working order and continue to be accurate.

Which Is Not Something on a Lensometer That Requires Maintenance