Made of fine quality material, practical, easy to install and use, wide application , has a long service life. Features: design, compact and lightweight, easy to carry and use. Users can choose according to the different needs of the and eyepiece magnification, working distance, field of view, depth of field and so on. High accuracy, zoom lens barrel flexible and comfortable. Widely used in microelectronics, molds, accurate machinery, jewelry, watches, jewelry, fingerprint identification, ticket identification, printing, mobile phone repairing, archaeology, bioanatomy, school teaching and other fields. It is the perfect industrial microscope accessory. Specifications: Material: metal Color: black Interface diameter: 25mm / 1.0in Type: 120X, 180X, 300X (optional) 120X lens: Working distance: 220mm / 8.7in Zoom C-mount lens 0.5X C-mount adapter Zoom ratios: 6.5:1 Objective magnification power by 0.7-4.5X (about 10-120X on the display) Item size: 148mm (L) * 50mm (DIA) / 5.8 * 2.0in 180X lens: Working distance: 125mm / 4.9in Zoom C-mount lens 0.5X C-mount adapter Zoom ratios: 6.5:1 Objective magnification power by 0.7-4.5X (about 10-180X on the display) Item size: 168mm (L) * 50mm (DIA) / 6.6 * 2.0in 300X lens: Working distance: 100mm / 3.9in Zoom C-mount lens 1.0X C-mount adapter Zoom ratios: 6.5:1 Objective magnification power by 0.7-4.5X (about 10-300X on the display) Item size: 245mm (L) * 50mm (DIA) / 9.6 * 2.0in Package size: 255 * 75 * 65mm / 10.0 * 3.0 * 2.6in Package weight: 120X: 500g / 1.1lb 180X: 520g / 1.1lb 300X: 700g / 1.5lb Package list: 1 * Lens