Hoffman Voltmeter, Complete Set

To Observe the effects of electric currents on liquids. Eudiometer tube having capacity of 50 ml and graduation of 0.2 ml is made of strudy Borosilicate glass with a large center reservoir bulb. The unit comes with a stand and a pair each of carbon and platinum electrodes. It runs on a 6 V battery or low-voltage power supply (not included). Includes instructions. Ready to use.