Type Pinless-Non Destructive Pinless-Non Destructive Pinless-Non Destructive Pinless+Pin Pinless-Non Destructive Pinless-Non Destructive Pinless-Non Destructive. Accuracy ±4% building:±2.5%; INDEX:relative building:±2.5%; INDEX:relative Pin:±2.5%; Pinless:Relative ±2.5% ±4% ±2%.