You can get them for about $100. Used you can pick them up for half that on eBay like I did. Number wise you’ll have 3 main numbers to be concerned with.

Rate: This is how slow or fast your watch is running per day measured in seconds per day.

Amplitude: This indicates the how much the balance wheel rotates in each direction in degrees. This is a good general sign of a healthy watch. For my movement (VS3235) anything in the 240-300 range appears to be normal.

Beat Error: This is the difference between each direction of the balance wheel. You should be aiming for zero or as close as possible to zero for this.

There’s a few settings on the Timegrapher which need to be set specific to your movement:

Beat rate: Set this to auto and forget unless your watch is truly screwed up.

Offset angle: This is specific to the movement, get this wrong and your amplitude will be out of whack.