GSTC Ultrasound Gel – For Smooth and Accurate Diagnostic Procedures This water-based gel is formulated for superior conductivity and excellent acoustic transmission, to facilitate clear ultrasound imaging with greater patient comfort. GSTC Ultrasound Gel is hypoallergenic, non-greasy, easy to clean and can be used on all skin types . For hospitals, clinics, physiotherapy centers and diagnostic laboratories. Supplied in various sizes and sterile packed for safe medical use.