Manual Portable lensometer Battery Powered Optical Lensmeter 110V/220V

Description

Brand New Portable Lensometer
Specifications:
1) Vertex Power Range: +15 diopter to -15 diopter; Vertex Power Step:0-(±)10D for 0.125D (±)10D-(±)15D for 0.25D;
2) Prismatic Power Range: 4 prism diopter; Prismatic Power Step:1diopter;
3) Cylindrical Axis Range: 0 to180 degrees; Cylindrical Axis Step:5 degree;
4) Lenses Accommodated: Diameter 20mm to 80mm;
5) Eyepiece Focusing:-5D to +5D;
6) Bulb: 6V/3W; .Power supply: 3V (2AA batteries)  not included
Operation Manual included
7)
Voltage 220V/110V Please tell me which voltage you need！