- The QOTSTEOS TL90 digital gauge is the ideal tool for measuring angles on RC helicopters from 250 to 800 mm - Features a digital gyroscopic sensor that automatically detects the horizontal angle and blade height - Backlit LCD screen makes reading easy in low-light environments - Automatic screen inversion function and angle lock for added convenience - Allows you to reset the angle to zero and perform precise calibrations - Measurement range of ±90° with an accuracy of 0.1 degrees - Made of durable and lightweight plastic, in black color - Compatible with helicopters with or without a flybar - Powered by 2 CR2032 batteries (not included) - Dimensions: 108 x 22 mm; screen size: 52 x 33 mm - Perfect for professionals and hobbyists seeking precision and ease of use when measuring helicopter angles