Plastic moulded ray box featuring ventilated metal lamp housing.
One single slit and two triple slits provided with ray box which can be used simultaneously.
A 12 V, 2 A bulb with a vertical filament is used as a light source.
Brass dial head 40 mm diameter divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on heavy brass disc, with 3 pointed legs, distance between legs 40 mm.
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