Cheap (and good) magnifiers for electronic works

[bdeianov]

The genuine Optovisor  spare lenses are ~ $25 ea

But Swapping lenses is not fast.

I swapped out the tiny screws attaching the lens with thumb screws and wing nuts. Swapping lenses is now a breeze.

[MLXXXp]

Does anyone know what's the difference between the OptiVISOR and the OptiVISOR LX?

My guess, based on the descriptions, is that the LX weighs less because it uses lighter (possibly high quality plastic) lenses.