Franklin Sensors ProSensor M150/X990 9-Sensor Stud Finder — 1.5" Deep Scan, AC Wire Warning

The Franklin Sensors ProSensor M150/X990 is a nine-sensor stud finder that locates the full width of wood or metal studs and warns of live AC wiring for safer, faster wall work.

If you hang shelves, install TV mounts, or run cables, pinpointing stud edges and centers quickly makes jobs cleaner and safer. The ProSensor M150 uses a dense array of nine sensing elements and a bright LED bar to reveal stud boundaries, centers and double studs without calibration. Its always-on deep scan mode reaches up to 1.5 inches into drywall and includes live AC wire detection so you can avoid drilling into energized circuits.

How does the M150 find studs more accurately than basic detectors?

Rather than relying on a single moving sensor, the ProSensor M150 scans with nine individual detectors at once to map a continuous area of the wall. The wide LED display lights up across the entire stud width, showing both edges and the center for precise placement. This reduces guesswork and false positives common with 1- or 2-sensor units.

• Nine-sensor array for overlapping coverage and higher resolution
• LED bar displays full stud width and highlights center position
• Detects both wood and metal studs without shifting or scanning motion

What safety features help prevent accidental drilling into live wires?

The ProSensor includes built-in live AC wire detection that actively warns you when an electrical conductor is present near the scanning area. This alert is integrated into normal scanning so you can see potential hazards before drilling. Note that it’s a warning tool—not a substitute for professional electrical testing.

• Continuous live wire detection while scanning walls
• Visual LED alerts to indicate possible energized wiring
• Use alongside proper electrical testing and local code practices

How easy is it to use on a busy job or small DIY task?

The M150 is designed for minimal setup: no calibration or repeated re-zeroing is required, even if you start scanning over a stud. Simply press and hold the button to power and sweep the wall; the unit’s deep-scan mode is always active. Lightweight and handheld, it’s ready for quick checks and extended use alike.

• No calibration—start scanning from any point, including over studs
• Single-button operation with clear LED readout for fast decisions
• Operates with two AAA batteries (not included); avoid rechargeable batteries

How deep and what types of materials can the M150 detect?

The ProSensor’s deep detection penetrates up to 1.5 inches into drywall, allowing reliable location of both wood and metal studs. Its sensitivity is tuned to reveal stud centers, edges and double studs across common wall thicknesses. For very thick substrates or layered materials, verify with a secondary method when absolute precision is required.

• Deep scan up to 1.5 inches through typical drywall
• Detects wood studs, metal studs and double-stud configurations
• Large sensor array reduces missed detections behind thicker finishes

Who this is for: The Franklin Sensors ProSensor M150/X990 is ideal for homeowners, handymen, carpenters and contractors who need fast, reliable stud mapping without routine calibration. It suits anyone mounting TVs, cabinets, shelving or fixtures and for tradespeople who value a compact, durable tool that reveals stud centers, widths and potential live wiring. For highly specialized applications (extreme wall assemblies, reinforced concrete), pair the M150 with complementary measurement tools or professional services for full assurance.