A portable ultrasound machine is a useful piece of equipment when space is at a premium, and it costs far less than a full size, stationary ultrasound device. eBay sellers offer a considerable range, from small, handheld machines with a 5-inch display, to much larger laptop-size ultrasounds with a screen size of up to 15 inches. Portable ultrasound machines are ideal for obstetric, pediatric, cardiovascular, endocrinological, radiological, and vascular applications. A battery-operated portable ultrasound machine is also useful in emergency situations without main power, or for use in the field. This important piece of equipment is an effective tool to check on the condition of a foetus, as well as to look for signs of internal trauma or disease when a full size machine is not practical or unavailable. Some even have space for SD cards so you can store the images the device captures for review at a later date. Purchase a portable ultrasound and rest easy in the knowledge that you have a reliable, useful medical tool at your immediate disposal should you need it.