Detectable materials - metal, power cables, wooden substructures. Maximum detection depth for steel 8cm, copper 6cm, power cables 5cm, wood 2cm. Automatic calibration. Includes protective case and marking pencil Requires 1 x 6LR 61 (9 volt) battery, included. Large digital display for clear and easy to understand results. Detects both ferrous (steel) and non-ferrous materials (copper pipes). Weight 0.5kg. Manufacturer's 2 year guarantee excluding professional use.