This Toshiba 2.0MHz CW Doppler Pencil Probe / Ultrasound Transducer PC-20M is a valuable tool for cardiology applications. The unit is of high quality and provides accurate results, making it a great addition to any medical laboratory. It is designed to work with continuous wave ultrasound technology, and its brand, Toshiba, is well-known for producing reliable medical equipment. This unit is sold as a single unit and is intended for medical and industrial use. It is categorized as a Medical Sensor Ultrasound Probe, and falls under the Business Industrial and Healthcare, Lab Dental categories. Get accurate and reliable results with this high-quality Toshiba Doppler Pencil Probe. Toshiba PC-20M 2.0MHz CW Doppler Pencil Probe / Ultrasound Transducer. What you see in the pictures, is exactly what you will be receiving.