HJ Digital Servo Tester
The HJ Digital Servo Tester is a versatile tool designed for testing and calibrating servos in various applications. It features an easy-to-read digital display and multiple modes for different testing scenarios.
Key Features
- Digital display for easy reading
- Multiple testing modes: Neutral, Manual, and Auto
- Compatible with various servo types
- Compact and lightweight design for portability
- Powered by a 9V battery (not included)
Technical Specifications
| Specification | Details |
|---|---|
| Model | HJ-20423 |
| Input Voltage | 4.8V - 6V |
| Output Voltage | 4.8V - 6V |
| Weight | 50g |
| Dimensions | 100mm x 60mm x 20mm |
Additional Info
This servo tester is ideal for hobbyists and professionals alike, providing reliable performance and ease of use. It is suitable for RC cars, airplanes, and other applications requiring servo control.

- HJ Digital Servo Tester / ESC Consistency Tester
- Can be synchronized output control 4 servos and used to compare the performance steering gear control of the steering servo output signal can be accurate to 2us (1 milliseconds = 1000 microseconds)
- you can test the steering gear is able to respond to subtle changes
- With PPM signal test function in the display, the input PPM signal changes while the input the PPM signal synchronization output to the servo
- Energized automatically enter manual mode (Manual) 20us 50H analog servo signal cycle, frequency 50Hz, rotary potentiometers to decrease or increase the width of the output pulse.

Specifications
- Size: 7.5 x 3.8 x 2.5 cm
- Weight: 25 g
- Input voltage: DC 5~6V
- Output signal width: 800-2200us
Want to buy in bulk?
Custom Requirements?
Discussion Forum
Feel free to ask questions, share tips or report issues.




