Optometry Optician y Adjustable Trial Frame Optical Trial Frame The product is shipped based on the color or size of the main image of the product page. : 100% new and high quality new optical trial lens frame, provides the ability to refract even the most difficult prescriptions and offers all the adjustments to ensure a proper and comfortable fit onto your patient Range of PD adjustments:PD of both eyes: 48 ~ 80mm;left or right PD: 24 ~ 40mm;minimum graduated value: 1mm Dividing disc axial graduation: Left dividing disc:120~0~135 Right dividing disc:45~180~60 Axial graduation increases along the lens frame axis counter clockwise,and the graduated distance is 5. Inner diameter of lens frame:32.5mm. Number of lens which can be inserted into left or right lensframe simultaneously:4 pieces Degree of lens rotating around optical axis in the lens frame:360 Nonparallelism between lens& 39;optical axis and lens frame& 39;s geometric axis:2.5 Non-concentricity between lens& 39;optical center and lens frame geometric center:0.5mm Displacement of lens in relation to position of lens frame geometric center:0.3mm Range of nose rest adjustment: Length:0 ~ 14mm; angle:0 ~ 30 Range of left or right lens frame leg& 39;s length adjustment:98 ~ 135mm. um interval between left and right lens frame legs:200mm : Material: lightweight metal or plastic : +Silver Size:14.5*6*3.5cm Net Weight:68g Package Weight:78g Package included: 1x Trial Frame