Aquasonic Ultrasound Transmission Gel – The World Standard for Medical Ultrasound Transmission. The AQUASONIC has become a valuable medical tool widely used for diagnostic and therapeutic purposes. Aquasonic Ultrasound Transmission Gel is ideal for midwives using a Doppler. Its popularity is a testament to its effectiveness in aiding medical professionals in providing exceptional patient care. Use a thick gel for procedures that require it. Comes with an empty 250ml container for refilling.