NSN 4920-01-641-9904

A plastic cuplike item consisting of a base to which five (5) standard spaced contractor pins are attached, two of the pins having platinum or platinum plated electrodes firmly attached thereto inside the cup. The cup is provided with a removable cap individually fitted to the inside diameter of same. Used as a component in a battery-water tester assembly to determine whether the water to be used in storage batteries has been contaminated.