Product description:
INS-11064 Portable Lensmeter <br /><br />Dimensions: 9 x 6 x 2 in / 23 x 15 x 5 cm <br />Weight: 2 lb / 1 kg<br /> <br />Specification:<br /><br />Vertex Power: Range: - 15.00 D to + 15.00 D / Step: 0.125 D ( 0.00to +10.00 D) 0.25 D (over +10.00 D) <br />Cylindrical Axis Range: 0 to 180 degrees / Step 5 degrees <br />Prismatic Power Range: 4 prism diopters Step l prism diopter <br />Maximum Lens Diameter: 80 mm <br />Eyepiece Focusing + 5.00 D or over <br /><br />Power DC 3 volts (2 AA size dry batteries) 50 MW