... Material: PVC Groove pitch: 0.3mm Focal length/Magnification: 3Xfeature ad advantages:1.cooper moulding board can be pressed into the ... of the business card,magnified three times ,ultraclear,print the ad.over 10 year's professional manufacturer and fresnel lens design ... .CE,Factory Audit,ISO9001,AGC. PVC Portable Magnifier BHM-02-B for business card