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Clean the silver wire with a fine grade emery paper and rinse it with distilled water. Insert the part to be coated into 0.1 M HCl and pass 10 mA/cm2 for about 1 min, using a platinum wire as a cathode. During the electrolysis a black deposit is formed on the silver. Rinse the electrode with pure water and insert it into the Teflon tube compartment filled with 1 M KCl. Before use place the reference electrode in a beaker with 1 M KCl for a few hours to reach a stable potential.
When not in use store the electrode in 1 M KCl.
The potential of an electrode prepared as above is within 1 mV of the expected value.   

http://www.tau.ac.il/~advanal/ReferenceElectrode.htm
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