Will help with
MetroTimer is the most accurate metronome app on the App Store. It provides highly accurate audio and visual feedback, and easy to use timer to track your practice sessions. MetroTimer, created by a software company that specializes in clock time measurement and regulation, is guaranteed to meet laboratory standards for accurate timekeeping.
Pros: Really useful and simple app for grading vestibular exercises and incorporating as part of a home exercise programme
Cons: Not able to track progress through the app
Version 3.3.2 tested July 2017