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Manual mode: Servo turns proportionally with the knob movement.
Neutral mode: Servo centers itself to it's neutral position.
Automatic mode: Servo cycles like windshield wipers.
The TGH electronic servo tester is a must have for every R/Cer's workbench.
With 3 modes you have the ability to check 1 to 3 servos at a time to compare their performance. Also works for ESC's and electronic retracts.