I'm really sorry, but the product I've got isn't working in the exspected way!
To be honest: It is even physically impossible, that it works anytime like it should.
The glasses are just able to zoom in the area close like one inch to the lense. If you look through it with both eyes, you simply cannot manage these two pictures into one (in your brain), cause the obsticle is to close to your face. = The (fix) focus point of these lenses is to close to the lense itself.
You can use it with just one eye at once, but it's still impossible to repair a watch with it!