TL90 LCD Display Digital Pitch Gauge Screw Pitch Gauge with Gyro Sensor for RC Airplane Helicopter ST250-800 Size

Works fine on my helis. Just a note since it comes with no instructions:1. One of the batteries will be flipped so as to not drain them while in storage (Won't turn on) so you will need to orient them properly after receiving.2. The On/Off button needs to be held for a second to turn on. It will turn off with just a quick press.It's a very nice quick way to check for zero pitch on your blades at center stick and read how much you have above and below.

Clips onto the rotor blades easily and so far has given me very accurate and consistent readings of both flybar and main rotor blades. I'm only using it on blades in the range of 285mm to 325mm, but it should work fine on blades that are much larger or even much smaller.The display is easy to read with a nice, even backlight, and it'll automatically flip 180 deg. depending on how you have the gauge mounted so the reading is always displayed upright.I'm not sure what the hold button is for. It just locks the display to show whatever value was measured at the time the button was pressed. I guess so you could take a measurement, remove the gauge and take it somewhere else without needing to write down the reading?

I have 100 to 450 size helis and one 700. I bought this item because my previous gauge is non digital and for 500 to 60 size . This works okay with small blades.

I tried a more expensive unit but this one is built better and was lower in cost

Good quality and works very well

accurate, useful, well made

6/04/2022, I like the digital display that allowed me to read the angles of my helicopter's blades. I was able to adjust the linkages yesterday to get to the 0 pitch angle I needed to reprogram my transmitters to the helicopter manual's recommended pitch curve settings. I just wished the pitch guage came with instructions and a sturdy container, but all in all the pitch came to me factory sealed in mint condition with fresh batteries to power the gauge.

Construction is so so and will shut off if handled the wrong way. This is due to he battery hatch not making good contact with the battery under certain conditions. Probably can be fixed... Otherwise unit seems to work well...