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No. 235 Eyeglass consists of two convex glass lenses housed in a strong plastic moulding. Magnification is x10 and lens diameter is 14mm. No. 231 Eyeglasses use a single 20mm diameter bi-convex glass lens in a black moulded mounting. Available in three magnifications at different focal lengths, x6 @ 1-1/2",x4 @ 2-1/2" and x3 @ 3-1/2".
No. 235 Eyeglass consists of two convex glass lenses housed in a strong plastic moulding. Magnification is x10 and lens diameter is 14mm.
No. 231 Eyeglasses use a single 20mm diameter bi-convex glass lens in a black moulded mounting. Available in three magnifications at different focal lengths, x6 @ 1-1/2",x4 @ 2-1/2" and x3 @ 3-1/2".