JH-40 LED 2.5M Children logarithmic visual chart light box ,2.5CM thickness
Description
| Size:620*280*25mm | |||||||
| Vision range:4.0~5.3(0.1~2.0) | |||||||
| Logarithmic vision chart | |||||||
| Convenient maintenance, just open box to check circuit or update the fluorescent tube. | |||||||
| Cabinet inside and outside adopt electrostatic spraying , beautiful and durable. | |||||||
| Chart board adopts organic glass plate, not easy to fade. | |||||||
| Choose fluorspar lamp as light source, configuration of electronic ballast, using voltage range is wide. | |||||||
| Use back shining method, solve the influence caused by a lack of natural light when testing far and near vision. |
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