It is cheaper than the silver voltameter, but slightly less accurate. This kind of voltameter is sometimes called Hofmann voltameter. "Voltameter" is a synonym for "coulometer". The electrochemical equivalent of an element is measured with a voltameter. This value is 2&colon;1 experimentally; this value is determined using Hofmann's water voltameter. The Hofmann voltameter is often used as a small-scale electrolytic cell. The voltameter should not be confused with a voltmeter, which measures electric potential.