Features: This gauge is compatible with helicopters equipped with a stabilizer bar or flybarless systems. The built-in digital gyro can automatically detect the height of the blades and display it on the backlit LCD screen. It automatically detects the horizontal angle. It includes an automatic screen inversion function. It can reset the angle to zero and lock it. Item type: Digital Pitch Gauge Material: Plastic Color: Black Applicable Length Of The Main Rotor: 250mm-800mm Applicable Width Of The Pulp: 20mm-75mm Operating Voltage: 3.0V DC Power Supply: 2 x CR2032 (NOT included); Operating Temperature: 0-40��C (32~104��F) Precision Measurement: 0.1 degree Measuring Range: 90 degrees Body Size: app. 108x22mm Display Size: app. 52x33mm Package includes: 1 x Digital Pitch Gauge Notes: 1. Due to different monitor and lighting effects, the actual color of the item may differ slightly from the color shown in the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.