Your system utilizes brass for the HandMass and the SureTouch Tips of your Stylus' because it is excellent at conducting electricity. During testing, a small amount of water must be applied to the client's skin where the brass makes contact. Water can cause the brass to corrode. Brass must be appropriately cleaned to provide accurate readings. While various brass cleaning gadgets are available on the market, we recommend manually cleaning all brass components as per our instructional videos below for the best results. The HandMass and Tips should be cleaned every week or more often, depending upon use. We recommend wiping down the equipment using isopropyl alcohol to remove oil residues and sanitize all accessories after each use.