A rugged silver‐silver chloride electrode has been developed and used successfully in a variety of field applications. The electrode housing is made of 2.54 cm o.d. clear acrylic plastic rod. The filling solution is 2.7Mpotassium chloride saturated with silver chloride, and contact with the external medium is made through a porous ceramic rod. Results of laboratory and field tests measuring the response of the electrode to chemical, thermal, mechanical, and electrical disturbances are presented.