Books I recommend: The Piano Book by Larry Fine This is the reference for helping piano buyers make informed choices. There is a wealth of information on piano construction that is easy to understand, as well as how to work with piano salespeople and tuner-technicians. During my training, I learned more about pianos from reading
It will be useful for you to understand one of the causes of the false beats phenomenon. We already know that a beat is heard when two strings are tuned with a slight difference in their frequencies. For example, a string tuned to 440Hz, set in vibration with another string tuned to 442Hz, will produce