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Space Marines Portal

Siege Auspices are powerful scanners that can see through the densest materials to find their weak points. These items are used for finding stress fractures, reinforced or up-armoured areas, hidden passages, power conduits, and the numerous other items of interest to a siege engineer. The machine-spirits of a siege auspex, while canny, can only see so far through solid objects and have a fixed range of about 20 metres. Things like energy fields, thick bulkheads, iron, stone, armaplas, and plasteel can reduce the range of the unit or blind it altogether.

Sources

• Deathwatch: Rites of Battle, pg. 146