This handy instrument has an easy-to-read LCD display for measurements and audio function when studs in walls are detected. Built-in calculator works out areas, volumes, metre/feet conversions. Distance range 600mm to 15M (2 - 50ft). Detects studs up to 19mm. Laser class IIA pointer. Powered by a PP3 battery (sold separately). The device features an easy-to-read LCD display and an audio function for detecting studs in walls. It also includes a built-in calculator for area, volume, and metre/feet conversions. The distance range is from 600mm to 15M (2-50ft), and it can detect studs up to 19mm. It has a Class IIA laser pointer and is powered by a PP3 battery, which is sold separately.