I have a Weishi 1000, it’s a good basic timegrapher for this hobby. It will give you an indication of accuracy (+/- sec/ day)
Amplitude reading which tells you the health of your movemen, specifically how far the balance wheel is moving in degrees, for this to be accurate you have to know the lift angle for the movement being tested or it will give you a false reading. This is useful because you can test on full wind and then again after 24 hrs rest to see how it performs when not at full wind. If it’s a poor result then time for a service. It tells you the frequency that your movement is running at, it does this automatically. It tells you beat error which is the difference in the swing of the balance wheel, indicated by two lines on the screen the further out the error the bigger the distance between the lines, at a beat error of 0.0 it will appear as one line. You can see how your watch performs in different positions and take an average by adding up the results and dividing by the number of positions recorded, maybe 5 or 6. This is all out of my head so anyone please feel free to correct me or embellish, I’m definitely no expert but I do enjoy tinkering. Have fun!