QM3552 magnifier - How do I swap the lens

The QM3552 is a desktop magnifier with LED lights and a 3 diopter lens. 

You can buy an optional 5 diopter lens QM3553 for it.

How to swap the optional lens

Turn the locking ring on the top surface anti-clockwise to release the ring

Lift the ring out and remove the existing lens

Install the new lens

Drop the ring back into place

Turn clockwise to lock.