S4OPTIK Model 90 Lensmeter has improved the standard lensmeter for optical labs: the B&L Model 70 lensmeter. Built to high standards like the model 70, the S4OPTIK Model 90 lensmeter will feel, act and provide the accurate measurements that you have grown accustomed to. New advances in technology have made the S4OPTIK Model 90 lensmeter better than the old standard - a new LED illumination system provides optimal target brightness and eliminates the need for an illumination bulb.