Glass gravity hydrometer. Mercury weight and paper scale. In blue cardboard tube. Range 800 - 850. Glass gravity hydrometer 1920-1950
Glass specific gravity hydrometer by J Hicks. Lead weight and paper scale. In tinplate tube. Range 650 - 700. Glass specific gravity hydrometer by J Hicks 1920-1950
Glass customs and excise specific gravity hydrometer by J Hicks. Mercury weight and paper scale. In tinplate tube. Range 650 - 900. Glass customs and excise specific gravity hydrometer 1880-1940
Glass streamline specific gravity hydrometer by J W Towers, bearing serial number 9093. Lead shot weight and paper scale. In cardboard tube, probably not original (too short). Range 0.600 - 0.700. Hydrometer index 255. Glass streamline specific gravity hydrometer by J W Towers 1920-1960