... multi-frequency 5. Measurement: Distance, circumference, area, fetal weight, fetal heart rate6. OB measurement: BPD, GS, CRL, FL, AD, HC, ... : up/down, left/right, black/whiteZoom: 2 times both in real-time and frozenFrame correlation: Three levels to adjust (B ... scroll up in B and B+B modes Resolution Lateral:≤2mm, axial≤1mm Body marks: 15 Measurement: Distance, circumference ,area, heart rate, EDD ...