Easily locate nails, screws, and metal items in wall with this versatile 4 in 1 electronic Accurately measure depths up to 120mm using the double head locator. Automatic calibration ensures reliable results every time. Suitable for DIY enthusiasts, contractors, and homeowners, this tool simplifies wall detection tasks, making it essential for home renovations or installations. Dustproof, anti drops, stable, and resistant to use, with an impact resistant shells and anti splashs water characteristics Move the instrument close to the wall, slowly, the display will show the distance between the detector and the instrument, Manufacturer: QAXRZCUCD