Made of fine quality material, practical, easy to install and use, wide application range, has a long service life.Features:Mini design, compact and lightweight, easy to carry and use.Users can choose according to the different needs of the objective lens 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: metalColor: blackInterface diameter: 25mm / 1.0inType: 120X, 180X, 300X (optional)120X lens:Working distance: 220mm / 8.7inZoom C-mount lens0.5X C-mount adapterZoom ratios: 6.5:1Objective magnification power by 0.7- 4.5X (about 10-120X on the display)Item size: 148mm (L) * 50mm (DIA) / 5.8 * 2.0in180X lens:Working distance: 125mm / 4.9inZoom C-mount lens0.5X C-mount adapterZoom ratios: 6.5:1Objective magnification power by 0.7- 4.5X (about 10-180X on the display)Item size: 168mm (L) * 50mm (DIA) / 6.6 * 2.0in300X lens:Working distance: 100mm / 3.9inZoom C-mount lens 1.0X C-mount adapterZoom ratios: 6.5:1Objective magnification power by 0.7- 4.5X (about 10-300X on the display)Item size: 245mm (L) * 50mm (DIA) / 9.6 * 2.0inPackage size: 255 * 75 * 65mm / 10.0 * 3.0 * 2.6inPackage weight:120X: 500g / 1.1lb180X: 520g / 1.1lb300X: 700g / 1.5lbPackage list:1 * Lens