Improvement on the safety of sweat-test equipment.

Patients with cystic fibrosis have a higher concentration of sodium and chloride 
in their sweat than normals. This observation led to the introduction 
of an iontophoresis technique for stimulating the sweat glands with pilocarpine. 
Occasionally, electrical burns result from defective equipment or from an incorrect 
or badly applied test procedure. A new design of equipment is 
presented which eliminates the possibility of a burn during the test. 
