Digital Angle Finder Protractor with Zeroing and Locking Function, 7-Inch Stainless Steel Angle Finder Ruler Product DescriptionNote: Random Color ( Black or Blue)Specification:Measure range: 0-360 degreesAuto-off : after 5 minutes of non-activityResolution: 0.05 degree (that’s 5/100th of a degree!)Accuracy: +/- 0.2 degreeRepeatability: 0.05 degreeBattery: 3V CR2032 with life of approximately 1 year Easy to read LED display, large digital numbers easier to read High Quality Ruler is laser etched with both inch and millimeter. Durable and wear resistant Two-in-one feature Ruler and Protractor 2 in 1. Both metric and imperial scale 360° measuring in both directions. Read more* QUICK AND ACCURATE READING - Digital LCD display for easy reading; Accuracy ±0.3°; Resolution 0.1°; Relative and absolute angle measurement; Hold and zeroing function* MULTI-FUNCTIONAL MEASUREMENT - 2-in-1 device to measure both length and angle, metric and Imperial Scale* RESETTING & LOCKING - The ruler could be held at any angle using the lock/open knob to adjust the tightness.* DURABLE AND SIMPLE ON/OFF - Ruler made of stainless steel for durability, It Could be well used in various fields besides of Angle ruler, Straight ruler, and Square Ruler.* RANGE & USAGE: Accuracy ±0.3°; Resolution 0.1°; Can work more than 2000 hours with one piece of CR2032 coin battery(Included);