Features: This gauge can be used on the helicopter that is equipped with stabilizer bar or flybarless, the built-in digital gyro can detect the height of the blade automatically and display on the backlight LCD screen. Automatically detect the horizontal angle. It has automatic screen inversion function. It can delay angle back 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(32~104 Precision Measurement: 0.1 degree Measuring Range: 90 Body Size: app.108x22mm Display Size: app.52x33mm Package includes: 1 x Digital Pitch Gauge Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin