Franklin Sensors ProSensor M90 Stud Finder
- Item Weight: 0.32 pounds
- Output Type: Digital
- Mounting Type: Wall Mount
- Unit Count: 1
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B07DPT6HSYModel: ProSensor M90Category: Stud Finders
Overview
Franklin Sensors packs nine sensors into the ProSensor M90 (model 330995279), a made-in-the-USA stud finder that needs no calibration and lights the full width of a stud on its LED display.
The selling point of the ProSensor line is using nine sensors instead of the usual one or two, so it lights up an entire stud rather than a single point.
- 9-sensor stud finder, made in the USA
- Deep scan up to 1.5 inches
- No calibration required
- Runs on 2 AAA batteries, not included
Who it's for
Homeowners and DIYers hanging shelves, TVs or cabinets who want a stud finder that shows the full stud width at once rather than hunting for a single center point.
Pros and cons
- Not compatible with rechargeable batteries
- At least one reviewer received two defective units in a row
Performance notes
Nine sensors read wall density at once, so the LED display lights the full width of a stud rather than requiring the user to sweep back and forth for edges, with the center LED turning green over the stud's middle. It scans up to 1.5 inches deep for both wood and metal, runs on two AAA batteries, and needs no calibration step before use.
Specifications
| Brand | Franklin Sensors |
|---|---|
| Model | ProSensor M90 |
| Dimensions & fit | |
| Item Weight | 0.32 pounds |
| Item Dimensions | 5.4 × 2.7 × 2 inches |
| Capacity & performance | |
| Output Type | Digital |
| Compatibility & installation | |
| Mounting Type | Wall Mount |
| Included components | |
| Unit Count | 1 |
| Included Components | Range |
| Other details | |
| Number Of Items | 1 |
| Sensing Distance | 1.5 inches |
| Part Number | FSM9002 |
| Item Highlight | Accurate Wood and Metal Stud Detector, Made in the USA, Shows Full Width of Studs, No Calibration Required |
Frequently asked questions
What batteries does the ProSensor M90 use?
It runs on two AAA batteries, not included, and is not compatible with rechargeable batteries.
Can the ProSensor M90 detect metal studs as well as wood?
Yes, its deep scan mode detects both wood and metal studs up to 1.5 inches deep.