Zircon StudSensor A100 Stud Finder
- Accurate Edge Finding For Diy Projects: Zircon StudSensor A100 helps locate wood and metal stud edges, while the LCD screen, audio tone, SpotLite Pointer and V marker groove help guide marking before hanging shelves, mirrors, cabinets or TVs
- Correct Calibration For Better Scans: Hold scanner flat against the wall, then press and hold the Power Button; in 1–2 seconds, a short beep confirms calibration is complete. Do not move during calibration, then slide slowly to scan
- Detects Live Electrical Wires: WireWarning Detection helps alert you to hot, unshielded electrical wires behind the wall, continuously detecting them up to 2 in. deep while you scan for studs or metal before drilling or mounting
- Low Battery Indicator: Lets you know when battery power is too low for proper scanning, helping you replace it with a new 9V alkaline battery with an extended expiration date for optimum performance
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A straightforward edge-finding stud finder with a live wire warning worth having before any wall mounted install, at a price that undercuts scanners with a visual display.
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ASIN: B09CV9TZWWModel: StudSensor A100Category: Stud Finders
Overview
The Zircon StudSensor A100 is a battery powered handheld wall scanner that locates wood and metal stud edges up to 1-1/2 inches deep and flags live electrical wires while you scan, guided by an LCD display, audio tone and a SpotLite marking pointer.
Two scan modes cover both standard drywall and thicker walls or ceilings, and the SpotLite pointer marks the edge directly on the surface instead of leaving you to guess between beeps. It runs on a single 9V battery, which is sold separately, and needs a short calibration step before every scan.
- Wood and metal stud edge detection to 1-1/2 in
- WireWarning live wire detection to 2 in deep
- StudScan and DeepScan modes for different wall types
- LCD display, audio tone and SpotLite marking pointer
Who it's for
Fits anyone hanging shelves, mirrors, cabinets or a TV who wants to check for hidden wiring before drilling into standard drywall. Less suited to mobile home walls or unusual wall assemblies, where one reviewer found it less consistent.
Pros and cons
- Detects live wires while scanning for studs
- SpotLite pointer marks the edge directly
- Two depth modes for thin and thick walls
- Low battery indicator warns before a bad reading
- Battery not included despite the price
- Less reliable on mobile home wall framing
- Occasional false readings reported by users
Performance notes
Accuracy depends on calibrating flat against the wall before each pass and sliding slowly rather than fast; the unit needs to sit still for the 1-2 second calibration beep before it will read edges reliably. DeepScan reaches up to 1-1/2 inches for thicker walls and ceilings, while WireWarning checks continuously for live wires up to 2 inches deep as you scan.
Specifications
| Brand | Zircon |
|---|---|
| Model | StudSensor A100 |
| Accurate Edge Finding For Diy Projects | Zircon StudSensor A100 helps locate wood and metal stud edges, while the LCD screen, audio tone, SpotLite Pointer and V marker groove help guide marking before hanging shelves, mirrors, cabinets or TVs |
| Correct Calibration For Better Scans | Hold scanner flat against the wall, then press and hold the Power Button; in 1–2 seconds, a short beep confirms calibration is complete. Do not move during calibration, then slide slowly to scan |
| Detects Live Electrical Wires | WireWarning Detection helps alert you to hot, unshielded electrical wires behind the wall, continuously detecting them up to 2 in. deep while you scan for studs or metal before drilling or mounting |
| Low Battery Indicator | Lets you know when battery power is too low for proper scanning, helping you replace it with a new 9V alkaline battery with an extended expiration date for optimum performance |
| Two Scanning Modes | StudScan Mode finds stud edges up to 3/4 in. deep for standard scans, while DeepScan Mode reaches up to 1 1/2 in. to help locate studs behind thicker walls, ceilings and surfaces |
Frequently asked questions
Does the Zircon StudSensor A100 need to be calibrated before every use?
Yes. It should be held flat against the wall while you press and hold the power button; a short beep after 1-2 seconds confirms calibration, and the scanner should not move during that step.
What battery does the Zircon A100 stud finder use?
It runs on a single 9V alkaline battery, which is not included in the box.
Can the Zircon StudSensor A100 detect live electrical wires?
Yes, its WireWarning feature continuously checks for hot, unshielded wires up to 2 inches deep while you scan for studs or metal.