When you immerse an electrode in its own salt, a half-cell voltage is generated between the electrode and the solution. Measuring half-cell voltages is difficult-since there is only one electrode. The Electrolytic Bridge separates the cell into two halves and connects them with a separate electrolyte. By measuring a series of electrode materials against a single standard, half-cell voltages can be established. The apparatus consists of a Y-tube with an overall length of 9cm. The end of each arm is fitted with a special ceramic material that lets ions pass through but not electrolytic fluid in your experiments. Includes instructions. Requires a voltmeter, sold separately.
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