For decades HBK Bruel & Kjaer have been servicing the Audiology Industry, supplying Ear and Mouth simulators, vital for product development, quality assurance and production line testing for hearing aids, earphones and smartphones that require full acoustic compliance and simulation. High-Frequency Head and Torso Simulator (HATS) Type 5128 with realistic Ear and Mouth simulators to 20kHz, provide a realistic reproduction of an adult human head and torso.