Precise spatial resolution measurements, simultaneously: axial, lateral and elevational. Test high frequency transducers used in echocardiography. 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. Sono408 with background attenuation of 0.5 dB/cm/MHz. This product includes a 1-year warranty.