RC Servo Tester 3CH Digital Multi ECS Consistency Speed Controller Checker Adjustment Steering Gear Tester CCPM Master with power suppy(4 cell 6v aa battery holder)for RC Helicopter Car Boat
Specification:
Type: CCPM Servo Tester, ESC or Servo tester
Output: ≤15mA (5.0)
Voltage Consumption: DC4.8-6V
Output Signal: 1.5ms±0.5ms
Size: 48 x 42 x 17mm/1.89 x 1.65 x 0.67in(Approx.)
Color: Blue

Works like a champ:Has 3 modes: servo test, servo centering, and servo swipe end to end.
it works and beats using the arduino.
The connections are well marked, and has 3 modes - manual, auto, and center.
works for centering servos before installation and to double check that new ones work like they should before plane takes off
Used with an brushless motor speed controller to test fpv drone motors out of the esc

Package Included:
2Pcs RC Servo Tester,
1x 6v 4cell battery holder jr plug;
1x RC On-Off Switch JR Plug