... , spot correlation, linear interpolation, etc Multi-frequency: 2.5MHz/3.0M Hz/3.5M Hz ... /4.0MHz etc. Multi-frequency selectedMeasurement: distansce, circumference/acreage, HR, pregnancy week ... frequency convex probeOPTIONALHigh frequency linear probe, electronic transvaginal probe, rectal probe, vidco thermal recorder, ultrasound image working station, etc. XF-300 Digital Portable ...