When you focus on a door or container, two indicators will appear to the left of your targeting cursor.

These indicators help determine if the object is locked and how much damage the object can take before it is destroyed.

The leftmost indicator displays the strength of the object. If no indicator is displayed the object can not be destroyed.

The rightmost indicator displays the lock strength of the object. Lock strength is represented by one to three lock icons.

The number of lock icons corresponds to the number of multitools necessary to open it. If no lock icon appears, the object is not susceptible to multitooling.