A smart little servo tester than can also be used to test ESC and also to determine motor direction before finishing off your model

Tests up to 3 servos at the same time.

The device also can be used as a signal generator for electric speed controller (ESC), then you can test your motor system without using a transmitter and receiver.
It has 3 Operation Modes;

1. Automatic mode:- Operates servos to their end point and back “window wiper” mode: Make the servo swing like window wipers in the biggest angle

2. Manual mode:- Turn the knob with different speed, check the reaction time

3. Neutral / Center mode:- Centres servos to their neutral position Ideal for when setting servos up in a model.

Specification:
Input: DC 4.8 to 6.0V ( can be powered from ubec or receiver battery)
Output signal: 1.5ms±0.5ms
Size: 36.5 x 31.0 x 22mm
Adjustment methods: manual, neutral, automatic.
Colour may vary