400mm rule digital angle rule that calculates angles quickly & accurately & is ideal for woodworking construction & machining. Digital display for angles. Stainless steel rule with metric/imperial scale, scale length 200mm & 7 inch. Measuring range from 000.0 deg to 360.0 deg, with accuracy of 0.3 deg. Rule locking function. Easy operation with two press buttons. Auto-shut off in 6 minutes. Digital display for angles. Easy operation with two press buttons.