Bundle: (2) CSRC-311 Standard Servo + (1) G.T. Power Digital Professional Servo Tester Save for purchasing as a bundle! Purchased separately these items would cost 31% more! CSRC-311 servos have the same specs as the HS-311 at a way better price! Provides the novice modeler all the performance and reliability you would expect to find in a more expensive servo G.T. Power Professional Servo Tester is most accurate way to test your servos! Servo tester is fully electronic for the most accurate, consistent testing; features high-contract LCD screen and large rotary knob for easy, simple programming