A round-style monitoring electrode with soft cloth backing for general ECG monitoring. Patented solid gel penetrates the skin quickly allowing high quality. Low chloride content minimizes skin irritation.. Drug Test, Single Test Cassette, Marijuana (THC), CLIA Waived, 25/bx. A round-style monitoring electrode with soft cloth backing for general ECG monitoring. Patented solid gel penetrates the skin quickly allowing high quality. Low chloride content minimizes skin irritation., Please note: This product is sold,by the box, Available: 14-21 Days. by the box