... M- or B/M- mode, four kinds of sweep speed of image display, 2s 4s 6s and 8s, ... logarithmic compression etc.4. It supports the measurements of distance, circumference, area, volume and fetal weight ... date, heart rate etc. It supports the measurements of distance, circumference, area, volume, heart rate, heart ... implements the real-time image upload to the computer.9. Image reversing: up/down, left/right ...