... external color monitorSoftware Function General Measurement: distance circumference, volume, EF, heart rate, timeObstetric Measurement soft: BPD-FW, CRL, GS, FL-FW, HC ... -D, VGAMonitor: external monitor can be usedMeasurement: distance, circumference, area, heart rate, pregnant week, fetal weight, EDDComments: real-time clock, date, scanning ...