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This is a lens designed specialy for thumb compasses, and can be used with different brands. The advantages of this model are that it is frameless, light, has a large 62 mm diameter size, has a high-definition, super-magnifying function and it is strong. This model is perfect for reading of small-scale maps.
Design for: all thumb compasses Size: lens diameter: 62mm Weight 30.89 Other 3.5X/ rotatable.