Detects the presence of electrical voltage & metal. Helps to locate wires, studs & fixings behind plasterboard & in walls.
Comes with (dirty & folded, but legible) manual.
Requires 1 x 9V battery. Battery is included, but may need replacing.
Newhaven Library of Things
http://newhavengreencentre.com/
http://newhavengreencentre.com/