... , no knobs, it integrates ultrasound power in a probe with a tablet in system of Windows 7 Specificationsno monitor ... , no knobs, it integrates ultrasound power in a probe with a tablet in system of Windows 7Specification:-Probes ... step=7mm);-Focus: C3 (R60) probe: 15 levels (25-150mm, step=5mm); L7 (L40) probe: 15 levels (15-85mm, step ... HC, AC, gestation age, fetal weight; USB B-type ultrasonic scanner