Top tenth magnifier.
This may not obviously be a candidate for our list of magnifiers. However whether you have an apple iphone or an android version any smart phone with a camera can be used as a magnifier.
If you can’t see something clearly use the camera phone to take a picture. Once you have captured it you can then blow the image up on the screen to see it more easily. It is a very flexible magnifier which is probably easily to hand.
For more information on mobile phone use go to the synapptic app page