There are 3 modes to check servos or ESC:
Manual mode: turn the knob with different speed, check the reaction time.
Neutral mode: make the servo go back to the neutral point.
Automatic "window wiper" mode: make the servo swing like a window wipers in the biggest angle.
Specification:
-Type: CCPM Servo Tester, ESC or Servo tester
-Output: ≤15mA (5.0)
-Voltage Consumption: DC4.8-6V
-Output Signal: 1.5ms±0.5ms
Package Includes:
2 x Servo Tester