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Eyeglass/loupe

 

Many in the trade  use ASCO eyeglasses,  they are available in various strengths, 2x, 2.5x, 3x, 5x 10x etc

The 10x was developed  for hairspring and escapement  work not general work.
The ASCO lenses are also available in a blue tint to the lens which many find easier to work with

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