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Near Visual Acuity Chart Opti+ model INS-11073

-Distance of testing: 25cm or 30cm

-The average brightness of visual chart is from 80 to 320cd/m².

-The equability of brightness of visual chart ≥0.85

- LED background chart (double sides)

- Test distance: 30cm

- Input: AC110V~240V, 50/60HZ

- Output: 4.2V, 1050mAh

Dimensions: 9 x 5 x 1 in / 23 x 12 x 2 cm

Weight: 10.35 oz / 293 g