The Stanley FatMax 300 Stud Sensor is your go-to tool for fast, reliable stud location and safe wall work. Designed for professional-grade accuracy in a compact package, this yellow-fatigued FatMax sensor takes the guesswork out of drilling, mounting, and wiring projects.
Why the FatMax 300 stands out
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Dual detection for real-world accuracy: instantly finds wood or metal studs and alerts you to nearby live electrical voltages, so you can drill with confidence and reduce the risk of shocks or repairs.
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Clear audio alert: audible cues accompany visual indicators, so you can identify studs and voltage without having to fumble with the device in tight spots.
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Compact, tactile design: at 6-1/2 inches long and 5 inches wide, it fits comfortably in one hand for quick scans across walls, behind shelves, or inside cabinets.
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Visible in any workspace: bold Stanley FatMax yellow provides high visibility on cluttered job sites or dim basements.
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Practical scanning depth: up to 1-1/2 inches lets you locate standard studs beneath typical drywall without excessive searching.
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Reliability you can trust: part of the FatMax line, built for repeated use in demanding environments.
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Battery considerations: powered by a 9V battery (not included), so you can choose a commonly available power source and keep working without proprietary packs.
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Packaging and setup: comes in clamshell packaging for easy storage and transport on the job site.
What you’ll use it for
Whether you’re mounting a heavy TV, hanging a gallery of frames, or installing shelving, the FatMax 300 helps you anchor to studs securely while avoiding hidden wires. It’s equally valuable for electricians and DIYers who need to verify wall integrity before cutting or drilling. The voltage detection feature helps you locate live AC lines, supporting safer electrical work and reducing the risk of accidental contact.
Ideal users and scenarios
- DIY homeowners planning kitchen, living room, or garage upgrades that require precise stud placement.
- Professional contractors installing heavy fixtures, cabinetry, or shelving where stud accuracy matters.
- Electricians or tech installers who must avoid live conductors during wall openings or mounting.
- Property managers performing regular maintenance on drywall, partitions, or interior walls.
How it compares and why it matters
Unlike basic wall scanners, the FatMax 300 combines metal detection and voltage sensing in a single, compact tool. This dual capability reduces the number of tools you need on-site and speeds up preparation time. Its durable construction and high-visibility color help you stay productive in busy environments, from crowded job sites to tight interior nooks where accuracy is critical.
Tips for best results
- Calibrate and test on a known stud to hear the distinct signals before starting your project.
- Scan slowly and sweep across the wall to cover all potential stud locations and hidden wiring paths.
- Keep the tool flat against the wall surface for the most accurate readings, especially around outlets or switch boxes where readings can be momentarily tricky.
- Plan your layout by marking detected studs and then double-checking with a second scan in adjacent areas to confirm alignment.
Product specifications
- Model: 300
- Brand: Stanley FatMax
- Detection: metal and voltage
- Scan depth: 1-1/2 in
- Dimensions: 6-1/2 in (L) x 5 in (W)
- Audio alert: Yes
- Batteries: 9V (not included)
- Color: Yellow
- Packaging: Clamshell
- Number in package: 1
- Warranty note: Vendor Internet Sales Policy restricts sale on third-party online marketplaces without direct written authorization from Stanley Black & Decker
With the Stanley FatMax 300 Stud Sensor, you gain a precise, reliable tool that makes wall work safer and faster. It’s the smart choice for any project that involves mounting, drilling, or electrical awareness—delivered in a compact, easy-to-use package that stands up to the toughest job sites.
