Hewlett-Packard, or HP, is probably best known for their personal computers, but the company is also a top producer of ultrasound machines. The HP Sonos line of ultrasound equipment is versatile, powerful and affordable, and over the years has proven to be some of the most reliable and durable machines in the industry. Many HP ultrasound machines have been in use for a decade or more are still going strong, proving that HP can be a great choice if you are looking to buy a pre-owned ultrasound machine at a low price. You can find more information about the full line of HP ultrasound equipment along with the best prices at Providian Medical.