DIYmall HJ Digital RC Servo Tester

Excellent tool, so useful it's amazing! It saves so much tint because you can find/set/,determine the position, travel, range of a servo including the PWM (Pulse width modulation) the PWM is how flight controllers etc... speak to the servos/ speed controller (you can do your initial setup of a speed controller even if it doesn't have a bt_heli interface). This allows you to see the pulse per second and even play a loop if you choose through the range, or center or just wherever you choose and the display makes it 100 times better than others!

I was looking hard for a simple solution to adjust servos with a digital read out. The digital read out at a good price was key. This tool works well. Make sure you put Signal pin up..! I use a LiFe 2S battery and the unit itself is small and easy to store in a drawer. This was and is a good fit for me as it replaced my aging HiTec 25 that is over a decade old and over sensitive to adjust. Modes on Select switch are "Manual, Center 1500 and end to end repetitive movement.". So far it has been great to use on my bench.

Excellent product

A pretty simple small device, but serves it's purpose pretty well. Simply plug in up to 4 servos and you can control their rotation with the knob. I teach kids basic electronics and kids break motors all the time. So this comes handy in testing whether motors are still functional. Does not come with batteries or USB port for powering, but can be easily powered from USB by using a USB cable with pin plugs (can be seen in the video). The overall device however is a bit cheaply made at least in terms of the housing body and the knobs, but I never looked inside the box and hopefully electronics are good and will survive long-term use. On a side note, even though it handles regular small servos pretty well, it did not work with the bigger servo (black one on one of the pictures) - the screen showed zeros, none of the controls worked and the motor kept shivering. Overall, works well, comes handy for testing small servos and will save you time from wiring such a tester yourself.

Worked fine for me. Would be nice if the instructions on the back of the packaging were clearer.

This is a fantastic servo tester. It came well and professionally packaged as can be expected from DIYmall. I used it to test 8 servos that I have and tested 4 at a time. It was neat to watch all 4 servos move in unison. Also I rigged a servo torque tester using some wooden paint stir sticks and 4 three inch springs I bougt at a local hardware store. So I hooked the springs up to all have the same tension on the servos and proceeded to manually turn the dial and see if any servos would lag behind with the load on them. So this can be used as a great servo load tester as well to make sure your servos still have enough strength and are equal in it for what ever job you have them intended for!

a good upgrade from my other fragile servo testers

Doesnt stay put. Fluctuates when not touching the knob. Cant switch between servos. You gwt what you pay for

This product performed well for about a month until it suddenly stopped working, while being used correctly on an SG90 servo. The company apologized and promptly sent a replacement that seems to function properly.

I find this unit handy for centering servos while installing servos and connecting the servo horn/arm. I leave the servo powered so it has enough resistance that the servo doesn't move off center while connecting the servo arm/horn or servo saver to the servo. You can manually check the servo travel with the adjustment knob. The servo response and speed can be observed while using the auto sweep setting. Just don't do that while connected to the steering linkage or the travel will likely go beyond the limits of the linkage and could cause damage. I hacked a spare USB cable and soldered on a lead from an old servo or fan I had in my junk box to power it. Very happy with the unit. Just the operating directions and wiring diagram in the box are poor. Fortunately the pictures on the the sellers site explain it better.

Petit problème a l'interne que j'ai réparer. Acheter une meilleur qualité a l'avenir.

I get power to the unit. I've tested 3 sets of servos. Only one will show the digital range move but no servo movement. The other two just make the screen freeze. *So it does work but not with Y connector to 2 servos*

Each time I have to use, I waste more time fidling trying to get it to power up, has a bad connection inside somewhere....