Cardinal Health Kendall Medi-Trace 530 Series Foam EKG Electrodes (31013926) - The Stress/Holter Electrode is designed for superior performance including adult Stress, Holter and Diaphoretic applications. Utilizing a highly aggressive adhesive the MEDI-TRACE 530 electrode is appropriate for the most challenging of monitoring environments. The high quality foam substrate conforms easily to the skin to ensure electrical contact for consistent tracings, leaves no messy residue to clean up and is designed to stay fresh up to 30 days out of the package. Size: 1-3/4" diameter. 30/BG, 20BG/CS. Price per bag.