PEAK full focus measuring loupes. High precision optical quality achromatic lens system with focusing from +2 to -2 diopters gives you a needle-sharp, brilliant image from edge to edge. Comes complete with measuring reticle, protective carrying case and lens cleaning cloth. Fully coated for color corrected flat field viewing. 360 degree clear acrylic base admits light from all directions. Smooth helicoid twist focus mechanism comparable to those used on high quality camera lenses. Removable glass reticles with black scales. 30X magnification, 7mm lens diameter, 5mm field view, 4 lens optical system, 0.05mm scale division, 26mm scale diameter, 5mm measuring range. Measures 36mm diameter by 28mm height.