Visibility Tester is made as per UIC 564-2. It has several
features as given below:
It is made of a wood whose inner side painted by fire
proof paint the ceiling of the chamber have a hole which
permit to hold light meter cell while testing. There is a
hole in the bottom of the chamber which is fitted with
clear glass bulb fitted to the bottom hole. An exhaust fan
fitted to one of side and have the hole which permit to
flow air at the time of the exhaust of the smoke to the
chamber. The front of the chamber has a hinged door,
which have a clear glass window. The LUX of the bulb is
controlled with the help of an regulator fitted in the front
panel of the instrument. The ceiling hole and the front
glass window covered with the black curtain during test.

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