Thanks guys that’s give me some food for thoughts
My personal experience says that if you always handle small devices like mobiles etc, there are lot good ones. But if you are also handling SMD devices with through hole too, just as in the case like Alex from Northridgefix, consider to try microscopes with detachable lenses, and those which are supplied with lens with longer focal length, say more than minimum 6 inches from the board to the lens and maximum focal of 12 inches work excellent. Or the silliest problem you will face is working on the board with a soldering iron / multi meter probes, and these will touch the lens. This case will make you concentrate on taking care of your lens rather seeing / working on the board. I had personally faced this and fortunately found a mobile repair shop guy who was interested in it.