The Reichert ML1 Manual Lensometer enables you to measure a variety of lenses accurately including single vision, bifocal, and contact lenses. The ML1's LED light source ensures that you will never need to change bulbs again. The comfortable glare-free, green illumination and sharp mires make measurement easy. The standard prism compensator extends the range to 15 diopters for more flexibility. Battery operated and completey cordless, the ML1 Manual Lensmeter gives you total mobility and no cord clutter. The LED's low power consumption and auto sleep feature ensure long run time / battery life. The standard AAA batteries are inexpensive and available everywhere. The Reichert ML1 can be adjusted to any angle, providing maximum convenience while measuring. Full 90 degree tilting allows for easy measurement of contact lenses. The ML1 can measure lenses from 24 to 90mm in diameter and uses bold crossline target for easy reading.