1000mm rule digital angle rule that calculates angles quickly and accurately and is ideal for woodworking construction and machining digital display for angles stainless steel rule with metricimperial scale scale length 500mm and 18 12 inch measuring range from 0000 deg to 3600 deg with accuracy of 03 deg rule locking function easy operation with two press buttons auto shut off in 6 minutes spare battery available ref batcr20323vwhats included1 x 3v cr2032 lithium battery specifications measurin