with Backlit Display and Tilt % Function!The mini-MAG II Protractor provides instant 360 Degree digital inclination display of any angle with the additional unique feature of embedded magnets on both sides and the bottom which make it ideal for a variety of measurements.Features. On/Off, tilt %, light and zero functions. Display is backlit for low light areas. Embedded magnets with 3.5lb. pull. Uses standard 9V battery (250 hrs.). Measuring range: 360 Degree (4 x 90 Degree). Display automatically inverts. Resolution: 0.05 Degree. Accuracy: ยฑ 0.2 Degree. Repeatability: 0.05 Degree