Harmony™ Ergonomic Scalers are your truly ergonomic hand scaling solution scientifically proven to reduce pinch force up to 65% and the amount of pressure applied to the tooth up to 37%. The handle of the 204SD DE Scaler is designed with TrueFit™ Technology, an advanced sensor-based technology system capable of measuring touch sensitivity and pressure at 40 readings per second, collected more than 2.8 million data points to develop this truly ergonomic hand scaling solution.