JH-25 2.5m normal children logarithm visual chart light box

Feature:

● 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.