Zircon StudSensor A100 Stud Finder with Live Wire Detection, Edge-Finding & DeepScan

The Zircon® StudSensor™ A100 is a handheld wall scanner that locates the edges of wood and metal studs and warns of live unshielded AC wiring while you prepare to drill or mount.

Whether you're a weekend DIYer or a professional installer, the StudSensor A100 gives a quick, reliable way to find solid fastening points behind standard drywall and many common substrates. It combines two scanning depths, an illuminated marking guide, audible tones and a live-wire alert to reduce guesswork before you cut, drill or anchor. Calibration before each use and scanning from both directions improves accuracy.

How does the Zircon A100 find stud edges accurately?

The A100 uses edge-finding sensors and a clear visual V marker to indicate stud boundaries rather than center points. Its SpotLite® pointer and LCD readout, together with audio feedback, help you mark the precise edge location so fixtures sit on solid material.

• StudScan mode locates edges up to 3/4 inch deep for typical drywall.
• DeepScan® mode extends detection to about 1 1/2 inches for thicker walls or ceilings.
• Illuminated V marker groove and SpotLite pointer for clearer marking.
• Audible tones and LCD screen confirm edge positions while you scan.

Can the A100 detect live electrical wires and how reliable is that?

WireWarning® Detection provides a continuous alert for unshielded, live AC wiring up to roughly 2 inches deep while scanning. It's a supplemental warning to help avoid surprises, but not a substitute for switching off circuits or using dedicated electrical testing procedures.

• Alerts to hot, unshielded wiring during both StudScan and DeepScan® modes.
• Not a precision locator—use as an extra safety cue, not the only protection.
• Always verify by turning off power and following safe drilling practices.

What materials and surfaces will the StudSensor A100 work through?

The A100 scans through many common sheet materials and finish layers found in homes, though it has limits on dense or metallic coverings. For best results, test and verify readings before committing to fasteners.

• Effective through drywall, drywall over plywood, and some thin coverings.
• DeepScan® can detect through bare wood flooring, linoleum over wood and thin wallpapers.
• Not designed for ceramic tile, carpeting, metallic wallpaper, glass or lath-and-plaster.
• Moist or freshly painted walls, foil insulation and dense materials may give false readings.

How do I operate and get consistent results with the A100?

Proper calibration and steady scanning are key. Press and hold the power button while the unit sits flat; a short beep indicates calibration complete. Then move slowly, scanning from both directions to confirm stud edges before fastening.

• Calibrate each time: hold flat, press and hold power, wait 1–2 seconds for beep.
• Keep the tool flat and slide slowly; avoid movement during calibration.
• Scan the same area from opposite directions to verify edges.
• Replace the 9V battery when the low-battery indicator appears.

Who is this for: The Zircon StudSensor A100 suits homeowners hanging shelves, mirrors, artwork, cabinets or TVs, and contractors needing a simple, portable edge finder with a live-wire warning. It’s built for routine wall work where speed, portability and basic electrical caution are priorities; for complex or critical electrical locating, pair it with proper circuit-testing tools and safety procedures.