Portable tympanometric instrument. Since pioneering portable tympanometry with the original MicroTymp®, Welch Allyn has worked to improve the technology so you can test for otitis media and other ear conditions on patients of all ages. As the only portable tympanometric instrument to offer 1000 Hz technology, the MicroTymp 3 works for hearing screening on patients from newborns to the elderly, so it’s the perfect choice for use in all health-care settings.