The 10x Scale Loupe with One Scale from Peak is a precision achromatic all-purpose 10x magnifier. A Standard Peak Scale reticle is included that measures in 1/10mm. This reticle has vertical and horizontal cross-hairs. On the horizontal there is a scale of 15 subdivided increments. This scale can be switched out with any of the other 12 reticles sold by Peak for this loupe. It has a smoothly rotating focusing ring with just the right amount of drag to prevent slippage while allowing easy rotating of the ring. It has a 32 mm FOV and an effective aperture of 20 mm. It weighs only 74 g. This is a solidly constructed loupe.