Aquascope Paterson Engineering Co Ltd

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Aquascope made by the Paterson Engineering co ltd

Windsor House Kingsway London 

Bakelite box contains Empty glass bottle of Brom Thymol Blue, alkalinity measure and 14 glass ph slides 

Not entirely sure what it is for. Measuring photography developing solution maybe?

Perfect for photography students or engineers.

Box is 19cm x 12cm x 6cm