Designed to provide the highest quality tracings for stress test procedures. The offset design and Aqua-Set gel significally reduce any motion artifacts ensuring a very clear stable trace even under the most strenuous conditions. The C-LINE technology ensures that every electrode will be fresh providing exceptional consistency in quality of recordings at very affordable prices.- Stress Test ECG Electrode, 40mm, Aqua-Wet Gel, Foam Backing, Diaphoretic, Hypoallergenic, 1200/bx 14-21 Days