GT Power 3 Mode CCPM Servo and ESC Consistency Tester
This portable device allows you to test the functionality of your servos and ESC without having to connect your radio, receiver and battery. Servos testers also allow you to easily center your servos when attaching servo horns and making control surface adjustments. This time-saving tool is a must have tool for any RC enthusiast.
Features:

Has three modes to check ESC or Servos:

Manual mode: Turn the knob with different speed. Check the response time
Neutral mode: Test the center point of your servo
Automatic mode: Make the servo(s) swing automatically to the greatest angle like a windshield wiper

Connect up to three servos at one time
Connect up to three ESCs at one time to test response time

Specifications:

49mm x 29mm x 43mm
Input Voltage: 4.8-6V

Requires:

4.8V DC Power Source - we recommend the Admiral 4.8V 2000mAh NiMH Receiver Pack with JR Connector