Bing found these results
Headphone test online, left-right check - WebcamMicTest.com
Head Impulse Test - Physiopedia
The Head Impulse, Nystagmus, Test of Skew (HINTS) Examination
The Ultimate Headphones Test - Audio Check
Headphone Test - Check Your Headphone | DeviceChecker
Head-impulse test (HIT) - Dizziness-and-Balance.com
THE ULTIMATE HEADPHONES TEST - YouTube
Head Impulse Test / Head Thrust Test | RehabMeasures Database
Head impulse test - Neurosigns
Head Impulse Test | Peripheral Vestibular Dysfunction - YouTube