I’m getting ready to buy a big magnifying glass, the type that mounts on an arm with a big lens in the middle of a circle of bright LEDs. When looking at different models, I see that the are mostly available in two, what are called diopters. 3 and 5. It seems they are more or less the same as 3 and 5 power. Which would be best for working on gun parts such as triggers and locks?
Thanks