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FeaturesAccurate and repeatable measurements Space saving vertical configuration Convenient tilt screen Full-color LCD display Built-in printer Icon-based operating system Push button controlsProduct Number15100 AL500Power Supply100-240V 50/60 HzSphere Power0 to ±25D (.25D, .12D, .01D steps)Weight11.5 lbs. (5.2 kg)Cylinder Power0 to ±10D (.25D, .12..