piano tuning, piano tuner
Dirk's Piano Tuner analyzes your instrument and uses the results to calculate the optimal tuning for your piano in particular.
After updating Windows 10 to version 1803 you can get this error:
Error opening wave device.
This can easily be fixed by turning on the following Windows setting:
Settings => Privacy => Microphone => Allow Apps to access your microphone.
Using this calculated setting, you can then tune your piano, in no time, to a professional level, without having to go through the classical, time consuming, process of 'checking the intervals'.