Donegan OpticalDA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length

The lens came off and is damaged from one end. Very disappointed. Can't return as I opened the box after coming back from a trip.

I bought this headband magnifier to be able to work hands-free on electronic circuitry and small surface mount components. I thought I'd be able to use a small soldering iron while wearing the visor, but at the point of good focus there's only about 3 to 4 inches of clearance between the lenses and the work. It can still be done, but you have to be careful as you bring the iron in and out of the working view so you don't burn the visor or the lenses.This magnifier is good overall. The fit is nice and snug and pretty comfortable to wear for extended time. The lenses are good quality, although if I had to buy another I'd get a lower magnification than this 3-1/2X. It's very hard to work with items because the focal length is under 4 inches. The 2.5X or 2.75X are probably better for getting more working distance. The knob-adjust headband is a nice feature for quickly adjusting to a snug fit, and the side knobs let you adjust the up/down swing very easily.I also ordered the OptiLoupe 2.5X addon, but that thing is pretty useless. It's very hard to use and it has a narrow zone of vision.Overall, the construction and quality of this headband visor is very good and it does what it claims.It costs a bit more than most others, but it seems to be of very good construction.