Glass Hydrometer range 1100-1300 with coloured zones, blue, white and red for charged, partly charged, uncharged conditions respectively. Glass body, compressible rubber bulb and rubber tube with fitting to body in card box.

Having 220mm long x 8mm inside diameter glass tubes one is closed at the top and other one is opened. The lower ends of tubes are drawn out and connected together by 1.5m of rubber pressure tubing 10mm outside diameter x 5mm inside diameter.