| Detection deepness | Wallboard thickness | Remark | |
| 0~0.5cm | 0.5~2cm | ||
| Wooden pillar / Metal stud | ≥3cm | 2~3cm | non-metal and dry Wallboard |
| Metal pipe | 6cm | 6cm | |
| AC voltage(50~600V) | ≥20cm | ≥20cm | |

Source: https://www.meterstesters.com/products/electronic-stud-metal-finders/scanner-and-tester-ms6906.html