Hydrometer, range 3.0-3.2
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Hydrometer, range 3.0-3.2, used to test the purity of bromide, made by J. W. Towers & Co. Widnes, with a mercury-filled bulb, in its original box, 1950s. Used at F. W . Berk & Co., Sandridge, St. Albans, Herts.
