I recently received the Hobbking servo tester which I've just tried out, a little unit I'd been meaning to get for some time. Diminutive in size and cost, the little tester is highly regarded for the facility it provides, primarily in being able to centre servos.
Servo centering is being able to put the servo at the neutral, or centre, position, where it is at the centre-point of its travel range. This is useful to be able to pre-install the servo arm without having to wait for the model to be assembled with ESC & battery installed.
Additionally, using a little trick, you don't even need an ESC to power the servo tester; by using a 2S battery, connected using its balance lead, you can get the tester up and running easily and conveniently...
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