I usually make a quick servo tester on a breadboard and use the serial monitor in the arduino IDE to get the servo positions, ...

An Arduino is used to determine the servo’s current position versus the desired position, and it turns the motor accordingly with a BTS7960 motor driver.

Making a servo tester using an Attiny85 micro chip, Attiny45 also works for this project. This diy servo tester is as good as ...