YoCoo TL90 LCD Display Digital Pitch Gauge Screw Pitch Gauge with Gyro Sensor for RC Airplane Helicopter ST250-800 Size LCD display with backlight, detachable split design (CR 2032 Li-on x2 220MAH included) Screen auto-reverse function Automatically detect the horizontal angle Delay angle to zero and lock function. Detect the angle range of 90 , For 250-800mm main roto.