G.T. Power Servo and ESC Tester Review

Review by Nicholas Turner, Staff Contributor


GT Power Tester


- Light wieght

- Supports 4.8V and 6V sources

- 3 operating modes

- Up to 3 servos simultaneously

- Connections are labeled for the positive

and negative wires

- Manual, center, auto modes


- Lightweight, cheap feel

- Instructions aren’t in depth and clear

- Couldn’t connect 3 standard servos simultaneously

- Auto mode not good for retracts


I won this G.T. Power Servo Tester at Warbirds Over Dixie 2014. At the time I connected up an old NiCd RX pack and a servo, nothing happened as I pressed the mode button and moved the knob to test the servo. I had a blue light, so I thought it was busted or not enough power from this old RX pack that couldn’t keep a charge. So I put it away. Recently I had the need to test four servos and two retracts going into the wing of a Top Flite P-40E Gold Edition kit build I’m doing. Since I didn’t have a spare NiMh or NiCd RX pack, I pulled this little gem out.


I hooked up a Castel Creations Thunderbird 9 ESC to the power in connection. Then noticed the labeling for positive and negative wires to the servos. The unit is designed for the servo connectors to be connected in a horizontal orientation. Previously I believe I connected them in a vertical orientation, no wonder the servos didn’t work in my previous futile attempt. So I connected two of my Hitec HS-485HB servos out of four. I went to connect the third and started getting frustrated. I had my wires lined up correctly, but it just wouldn’t go. Thought I wasn’t clearing the top of the servo tester casing, so I moved one of the already connected up on to free the middle and tried again. No go again. Investigation showed there just isn’t enough clearance to squeeze three servos in.


I connected a spare 2S lipo I used in the plane the ESC was in to the ESC and got a blue LED on the servo tester. This serves as power indicator as well as the mode the servo tester is in. I was in manual mode, so I moved the knob left to right and watched my servos move accordingly. I disconnected these servos, connected two more and did the same test. Next came my retracts from Wingspan Retracts. I knew these worked as I tested them the old school way with spare RX and RX pack with my TX about a year ago. I found with the servo tester I had to not start in center position with the knob in order to extend the gear, and then lower the gear.


I did a second round of tests, this time to ensure the extensions needed to snake through the plane’s wing were not defective. This time I tried each mode. I pressed the mode button the tester and saw the LED change to the next mode’s. Center mode did what it is to do, centered the servos. Auto mode sent a signal to the servos that moved them back and forth continusouly, but not through the full range of movement. Auto mode did nothing for the retracts as it wasn’t a long enough signal.


Now that I know how to use this servo tester, it’s going to become a staple for me. The ease of centering servos and testing them after a crash without the need to tie up an RX is a plus for me. Seeing how useful this tool is, I think it’s a great staple to have handy. A quick search online shows an exact copy of this one branded by Turnigy from HK. In the days of Chinese clones and rebranding for various companies from one manufacturer, this didn’t surprise me. Whether it’s the G.T Power brand or another brand of this exact servo tester, you can’t go wrong.