GT Power Digital LED Servo Tester - GTPLEDSRVT
The GT Power LED servo tester is the next level up from our basic manual tester. This model allows you to connect up to four servos simultaneous and includes an LED display which shows you the pulse width in real-time. Why do you need a servo 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:

Dual mode - Manual and Automatic
Manual mode allows you to check the servo speed and reaction time
Automatic mode lets you drive the servo through its full travel from end-point to end-point (like windshield wipers)
1 to 4 servos may be connected simultaneously
3-digit LED displays pulse width in real-time

Specifications:

Input voltage: 4.8 - 6V
Pulse width manual mode: 700 - 2300ms
Pulse width auto mode: 800 - 2200ms
Dimensions: 73.5 x 43.5 x 22.5mm
Weight: 68.9g

Requires:

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