The Sealey Battery Fluid Tester is a professional battery hydrometer designed for accurate testing of battery electrolyte specific gravity. This precision testing tool is suitable for technicians and mechanics working with 6V, 12V and 24V battery systems across automotive, marine and industrial applications. Built with tube construction housing an integrated float gauge, this hydrometer provides clear readings of battery fluid condition to help assess battery health and charging status. The built-in thermometer enables temperature compensation, ensuring accurate measurements across varying workshop conditions where temperature can affect specific gravity readings. Lightweight and portable at just 0.11kg, this battery tester is an essential diagnostic tool for workshops, mobile mechanics and fleet maintenance operations. The simple operation and clear visual indicators make it straightforward to identify weak cells or batteries requiring charging or replacement. Features and Benefits: