Franklin Sensors ProSensor M90 Stud Finder
- 9 sensors across the face
- Wood and metal studs detected
- Shows full stud width, no calibration
- 1.5 inch sensing depth
- 5.38 x 2.75 x 2 inches, 5.12 ounces
- Made in the USA, digital output
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A stud finder that maps the whole width of a stud at once, so you mark edges without sweeping back and forth. It senses only a short depth, so thick wall coverings can defeat it.
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ASIN: B07DPT6HSYModel: ProSensor M90Category: Stud Finders
Overview
A wall in a bedroom, garage or basement is where this scanner works: press it flat and the row of sensors lights up to outline the stud. Franklin Sensors lists it as a digital tool for wood and metal studs that needs no calibration step.
The reason to buy is the nine-sensor array, which outlines a whole stud in one placement and speeds up hanging shelves or mounts. The limitation is the shallow sensing depth, so plaster over lath, tile or double drywall may hide the target.
Who it's for
Homeowners and renters mounting shelves, TVs or cabinets will get quick edge marks from the full-width display. Tradespeople who scan unusual walls or need pipe and live wire detection should check for a tool that lists those modes.
Pros and cons
- Full stud width shown at once
- No calibration needed
- Detects wood and metal studs
- Made in the USA
- Shallow sensing depth
- No wire detection listed
- Battery type not listed
Performance notes
Multiple sensors compare density changes across the wall face, which lets the display outline both edges of a stud from a single placement. Reading accuracy depends on keeping the unit flat against the surface. Textured paint, thick wall covering or metal lath can shift or mask the result.
Specifications
| Brand | Franklin Sensors |
|---|---|
| Model | ProSensor M90 |
| Dimensions & fit | |
| Scan depth | 1.5 inches |
| Item dimensions | 5.38 x 2.75 x 2 inches |
| Item weight | 5.12 ounces |
| Capacity & performance | |
| Output Type | Digital |
| Construction & materials | |
| Materials detected | Wood and metal studs |
| Compatibility & installation | |
| Mounting Type | Wall Mount |
| Included components | |
| Included Components | Range |
| Unit Count | 1 Count |
| Other details | |
| Number of sensors | 9 |
| Part Number | FSM9002 |
| Item Highlight | Shows full width of studs, no calibration required, made in the USA |
Closest rivals on specs
The StudBuddy Pro Magnetic Stud Finder with Level- Item Weight 0.32 vs 0.22 pounds (+45%)
eOUTIL ST100 Stud Finder Wall Scanner- Item Weight 0.32 vs 0.2 pounds (+60%)
CH Hanson 03040 Magnetic Stud Finder- Item Weight 0.32 vs 0.13 pounds (+146%)
Frequently asked questions
Does the Franklin ProSensor M90 detect wires or pipes?
No. The listing names wood and metal stud detection only. It does not list wire or pipe detection.
Do I need to calibrate the Franklin ProSensor M90?
No. The listing states that no calibration is required.
How deep can the Franklin ProSensor M90 sense?
The listing gives a sensing distance of 1.5 inches.