Ensure accurate screening, diagnosis and monitoring. Patented HE (High Equivalency) Gel™ helps guarantee your transducers and system settings are fully tested across the entire frequency range form 2 to 18 Mhz. The Sono403 phantom is proven to exceed ACR, ECR, AIUM and other program requirements. It has precision-placed targets and zero defects. Sono403 SCG with background attenuation of 0.5 dB/cm/MHz. This product includes a 1-year warranty.