Super handy servo tester. I use mine all the time. Connect to a 5v power source (Our 4 AA Battery Holder is perfect).
You can then test or center any servo. Has 3 modes.
Mode 1 - Tester controls servo with knob.
Mode 2 - Tester automatically centers servo
Mode 3 - Tester moves servo back and forth - good for break in.
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