In many cases the "960 fps" slow motion is actually software interpolated, which makes it less useful for measurement purposes. It can be annoyingly difficult to figure out what the true frame rate of a phone camera is. For example https://www.androidauthority.com/samsung-galaxy-s20-ultra-96...
Many cases? The article speaks of one phone model doesn't support it and whose spec sheet never said it did, if I'm reading it right
I did notice with a daylight lamp, which seemed to instantly go from 0 to fully bright, that my phone would show a left to right progression on some recordings regardless of the lamp's orientation. This must be the sensor being scanned from left to right, but for all I know it completes each scan at the indicated frame rate. If there were interpolation, I'd expect to see things like the microwave digits to appear in a half-on state for each interpolated frame. I can check again but don't think this happened to anything where no half-states are expected
Anyway, when measuring things between a dozen and a gross amount of milliseconds, also the cheap 240 fps (~4 ms) slow motion cameras will be able to give a good estimate. If you think you're capturing 960 but it's actually half, that's lying to the consumer but still a decent measurement
