Glasses-type binocular loupe 21NM

TTL GALILEO LOUPES — 21NM Series Magnification Rate: 2.5x/3.0x/3.5x Interpupillary Range：54-72mm(adjustable interpupillary) Working Distance：300-580mm/400-400mm Depth of Field: 200mm Barrels material：PC Lens Material：A+grade Magnifying Glass/Cleaning Cloth/Fixed Rope/Warranty Card/Storage Bag Feature: 【Ultra-light Lens】weighting only 40-50g ，as light as wearing nothing. 【Excellent Optics】excellent optical design-the lens adopts A+grade imported optical glass，color high fidelity，Multi-layer coated premium grade，light transmittance is over 99%. 【Wide field of view and depth of field】providing a wide field of view and depth of fied, no blurred at the edges of the circle of vision. 【Convenient customization】provide optometry sheet only 【Amblylopia available】provide solutions for myopia glasses/ reading glasses. 【Delivery days】about 7 working days delivery 【Light Source】lamp holder lightweight and compact, weighting only 10g, highlight spotlight uniform light spot, no visible strobflash, not dazzling. Stemless brightness knob adjustment, yellow light filter can be added, filter blue light, super long runtime 4/12hours( optional power supply)