I've been experimenting with various and sundry illuminated magnifiers over the last several years, in search of "the perfect solution". All of the systems I've tried have had one shortcoming or another.
I have a tiny pocket 15x illuminated magnifier that I take to shows with me. However, squinting through tiny lenses gets old after a while.
Fast forward to Chicagopex a few weeks ago. One of the revenue dealers I frequent had a magnifier I had not seen before. While not compact and a bit on the expensive side, I *loved* the usability.
It's a stand magnifier built by a German company called Eschenbach. The beauty of the system is that you can get swappable lenses from 3x up to 12.5x. The 12.5x is the one that the dealer was using - perfect for flyspecking or looking for faults.
They make it with 3 different light sources: incandescent, halogen, and LED, as well as both battery and corded versions. An LED handle plus one of the lenses will run you over US$150... not cheap. It appears they are cheaper in the U.K., where a handle-lens combo runs about 80 pounds.
Here's where
ebay comes to the rescue. You can pick up second hand units (handles only, lenses only, and combos) at substantial discounts. You want to make sure that you get the LED handle, *BUT* the lens heads will fit all 3 types. I was able to pick up, through separate auctions, an LED handle, 12.5x lens, and 6x lens, all for about US$100 total.
The battery versions take two C size batteries (that's what they're called here in the U.S.; I'm not sure if battery sizes are an international standard).
The 6x head is a 50mm lens opening, and the 12.5x is 35mm. Both are quite usable. Also, because it is a stand magnifier (sits perfectly flat and stable on a flat surface) it is perfect for holding against a cover or document without having to deal with angle or orientation.
Because it's a larger magnifier, it feels very solid and robust in the hand.
Manufacturer page:
http://www.eschenbach.com/products-...uminated.htmComparative pictures. 12.5x:

6x:

These are not sold as hobby products but as enhancements for the vision-impaired, so you are more likely to find them through medical supply companies.