BL-3 Worn like glasses, thus leaving the hands free for working and manipulation for detailed inspection. The BL-3 Galilean Telescope design has pre focus medical loupe style construction, high quality coated multi lens structure at a reasonable price. Includes interpupillary (IPD) and nose bridge adjustments. Also called close viewing binoculars this model has a comfortable 3x magnification with a working distance of 11-16 inches -Constructed with high quality multi glass optics and metal alloy lens frames. Comes with storage case.