... frequency 2.5~8.0MHz(Depend on the different probes) Display Mode B. B+B, B+M. M Scanning Depth ... -processing, correlation processing,,r line calibration and interpolating Screen Display 10.4 LCD MonitorEditor for the annotation of ID. ... Measurements Multiple calipers to do measurements of Distance, Circumference, Area, Heart Rate ,Rate, Fetus weight, Pregnancy weeks and EDD. Trackball operation 6 ...