Shin Nippon LM-15D Lensmeter Lightweight, cordless models can be carried any place. No cord to obstruct handling the lens meter. And now you can use the LM-15 with an AC adapter! Features: New refined appearance with convenience-oriented design ensure operational ease. Troublesome lamp replacement is eliminated by an LED light source. The auto power-off function maximizes battery life. Batteries run for more that 200 hours continuously, and the power-off time is adjustable (2-6 min.). Can be clamped at any angle within from 45° - 90° allowing measurement while in a comfortable position. Can be tilted to a full 90° for easy measurement of contact lenses. When an AC adapter is connected, the battery supply circuit is automatically closed to save battery life. Includes: 2 Alkaline batteries 1 Dust Cover 1 Standard Lens Holder 1 Contact Lens Holder 1 Bifocal Lens Holder SPECIFICATIONS Vertex refracting power Measurement Range 0~+/-25D Graduation Within +/- 3D : 0.125D step Over +/- 3D : 0.25D step Prism refracting power Measurement Range 0~5D Graduation 1 D step With prism compensator Max. 20 D Axis angle Measurement Range 0~180° Graduation (Internal) 1° Graduation (External) 5° Inspection lens diameter (Measurement range) 24 ~ 90 mm (Contact lens possible) Tilting 45° ~ 90° Power Supply SUM3 battery x 2 or AC adapter(option) Light source LED Dimensions 355(H) x 340(D) x 170(W) Weight 3.6 kg   Shin Nippon 50 Years of Quality Founded in 1954, Ajinomoto Trading, Inc. has been supplying customers with, medical equipment, release paper, chemical goods and other products produced by its parent company, Ajinomoto Co, Inc. for almost 50 years.