WWZMDiB 4Pcs RC servo Tester with 3 Modes to Check servo or ESC, able to Easily detect and configure Server Virtual Space, Jitter and Median, servo Controller

Great product fast shipping

Tested all four of these after receiving them and they all worked. Great for testing servos and ESC's . Small enough to keep one in flight box for just incase use.

They are made from the plastic most other products come packaged in. Flimsy... you know the stuff you have to cut through to get something out of the package? These are made with that plastic. Also, annoying, these are not stand-alone testers. You have to use them in line with an existing circuit. They have no power built in, only a three pin input connector. I'm sure they have uses, and they do work. They're just not the tester you see on some videos where you just plug in a servo and test it. You get 4 of them, so, can't complain too much. Just not what I thought I was buying. No hookup instructions, but if you're buying these you probably already know.

They work great I bought the extra ones to givr away,

Quick delivery and packaged well

I checked all 4 of the testers on receipt and they all work for my purpose (as a throttle control). I connected them to the throttle output from my brushless ESC and then used the knob to start and run the brushless motor. I checked all 3 outputs as well as the input separately. I had originally connected 4x AA batteries to the input which powered on the testers. However, I noticed that when connecting the ESC's throttle output to the tester's output, I did *NOT* need any power connected to the input side as it seems to draw the power provided by the ESC connector. So, in case anyone's wondering how to use these (as there aren't any instructions provided), you only need your ESC, motor, RC battery and the tester. Make sure the tester's knob is in the lowest position. Connect the ESC to the motor and the ESC's throttle lead to one of the servo tester's *outputs*. If it's an RC plane/drone motor, make sure there isn't any prop connected to the motor. Now, connect the ESC to your RC battery. When you slowly turn the knob, it should start the motor and the knob will act as a throttle control. I haven't tested the other modes of the tester to see if/how they work.

cheap and good.

I definitely wasn't expecting something so delicate. When I say it has a flimsy plastic sleeve, its made out of the same clear plastic that is used as product packaging for a cheap charging cable or wired earbuds. That's all that's protecting the circuit board... But it's open-ended on each side leaving the board exposed to dust and moisture, so don't expect this item to last very long. I needed a servo tester that would stay on auto mode, and continuously move the servo horn, but this one reverts back to manual in less than 10 seconds. Very disappointed.