Detects ferrous (80mm), non-ferrous metals (60mm), steel frames and wood (20mm). As well as an AC wire detection with LED indication, the illuminated ring indicates the detection status. Detects Ferrous Metals, Non-Ferrous Metals & Wood LED Indicators Max. Ferrous Detection Depth: 80mm Max. Non-Ferrous Detection Depth: 60mm Max. Live Wire Detection Depth: 50mm Auto Power Off in 5 Minutes Visual Alarm Detects Ferrous Metals, Non-Ferrous Metals & Wood LED Indicators Max. Ferrous Detection Depth: 80mm Max. Non-Ferrous Detection Depth: 60mm Max. Live Wire Detection Depth: 50mm Auto Power Off in 5 Minutes Visual Alarm