Abstract This test is designed to characterize and compare the signal quality of traditional wet (gel) electrode contact material vs. the dry (stainless steel) electrode contact material used in the device after post processing of collected raw data from each electrode type. Two types of contact electrode materials were used: 1) Electrode Pair A- Hydrogel Electrodes: MEDI-TRACE(R) 500 ECG ELECTRODE (K945479), and 2) Electrode Pair B- Stainless Steel Electrodes: 136 SS of final device.After frontend filtering and baseline removal, both pairs (A&B) are qualitatively similar. This is mainly due to the fact that SS tends to have more differential baseline movement caused by higher contact resistance to the skin. Results show that after signal processing (including bandpass filtering and additional baseline removal), two simultaneously captured ECG signals, the first one using HG electrodes, and the second using SS electrodes, are equivalent in terms of SNR and correlation. Although both this device (K172654) and predicate (K150869) use as dry electrodes and are equivalent, this report provides additional comparison of wet (gel) electrode with dry (stainless steel).