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 600 mm to 15 m (2--50ft). Detects studs up to 19 mm. Laser class iia pointer. Powered by a pp3 battery (sold separately). All draper tools are manufactured to high quality standards that are strictly controlled by our quality control engineers. They offer good value for money and a number of useful features to improve the performance of the product. All draper products come backed by the draper tools guarantee. Draper tools is a family-run company that has been selling high-quality tools in the united kingdom and beyond for more than 90 years. To bring you the tool you need, the draper buying team sources innovative products, which adhere to strict ethical and quality standards, from all around the world.