Manual Lensmeter Lensometer Focimeter Optometry Machine Ac/Dc NJC-4 uc

DC 3 V; AC 220 V 50HZ/ 110 V 60HZ. 2,AC/DC power source (DC 2x 5# AA battery, Battery not included). 1,Simple operation and easy to use. 5,Compensation prism can modified points of light center. - 20 D ~ + 20 D, 0.12 D step.

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