The Digi-Pro 12"/300mm electronic protractor includes embedded magnets for unique measurement areas. Use the Digi-Pro to make fast and accurate angulard measurements. On/Off, Zero, Hold and Reverse feature to invert the display for easier reading in certain situations. Embedded 25 lb. pull magnets. Full, 360° measuring range. Accuracy: ±.2°. Repeatability: ±.05°. Resolution: .05°. Invertible display feature. Voltage: Standard 3V lithium battery., Lot of 1