Zircon
Zircon MultiScanner i520 OneStep Multifunction Stud Finder
$49.99Cheaper
Best Stud Finders · head-to-head
Zircon MultiScanner i520 OneStep Multifunction Stud Finder vs Bosch GMS 120 Professional Digital Multi-Scanner
A sourced, side-by-side comparison. Zircon MultiScanner i520 OneStep Multifunction Stud Finder is cheaper at $49.99. Every spec and price links to its source.
Which is better: the Zircon MultiScanner i520 OneStep Multifunction Stud Finder or Bosch GMS 120 Professional Digital Multi-Scanner?
On the specs we track, they're closely matched. The Zircon MultiScanner i520 OneStep Multifunction Stud Finder is the cheaper at $49.99.
See Zircon MultiScanner i520 OneStep Multifunction Stud Finder on Amazon See Bosch GMS 120 Professional Digital Multi-Scanner on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Zircon MultiScanner i520 OneStep Multifunction Stud Finder |  Bosch GMS 120 Professional Digital Multi-Scanner |
|---|---|---|
| US price | $49.99 | $109.48 |
| Brand | Zircon | Bosch |
| Released | — | — |
| Max scan depth (in) | 3 | 4.75 |
| Sensing technology | capacitance (StudScan/DeepScan) + magnetic/inductive (Metal Scan) + AC field (WireWarning) with AutoCorrecting Technology (ACT) | capacitive/inductive multi-mode with automatic calibration; illuminated status ring (green/orange/red) |
| Detects wood metal live wire | wood studs, metal (ferrous to 3 in., non-ferrous to 1.5 in.), live AC wiring to 2 in. | wood studs, ferrous metal to 4.75 in., non-ferrous metal to 3.125 in., live AC wiring to 2 in. |
| Sensor array width (in) | — | — |
| Center vs edge find | center and edge find (4 modes: Stud Scan, DeepScan, Metal Scan, AC Scan) | automatic center finder for detected objects |
| Display type | backlit LCD display with SpotLite laser-style pointer | illuminated graphical display |
| Calibration method | automatic via ACT (AutoCorrecting Technology); no manual calibration step | automatic calibration in each of 3 modes (wood/metal/AC) |
| Power source | 9V alkaline battery (not included) | 9V battery (included) |
Sources — Zircon MultiScanner i520 OneStep Multifunction Stud Finder: zircon.com (verified 2026-08-05). Bosch GMS 120 Professional Digital Multi-Scanner: boschtools.com (verified 2026-08-05).
What's the difference between the Zircon MultiScanner i520 OneStep Multifunction Stud Finder and Bosch GMS 120 Professional Digital Multi-Scanner?
Where the two actually differ on the specs we track (7 of 8). Matching specs are omitted.
- Max scan depth (in): Zircon MultiScanner i520 OneStep Multifunction Stud Finder 3 vs Bosch GMS 120 Professional Digital Multi-Scanner 4.75
- Sensing technology: Zircon MultiScanner i520 OneStep Multifunction Stud Finder capacitance (StudScan/DeepScan) + magnetic/inductive (Metal Scan) + AC field (WireWarning) with AutoCorrecting Technology (ACT) vs Bosch GMS 120 Professional Digital Multi-Scanner capacitive/inductive multi-mode with automatic calibration; illuminated status ring (green/orange/red)
- Detects wood metal live wire: Zircon MultiScanner i520 OneStep Multifunction Stud Finder wood studs, metal (ferrous to 3 in., non-ferrous to 1.5 in.), live AC wiring to 2 in. vs Bosch GMS 120 Professional Digital Multi-Scanner wood studs, ferrous metal to 4.75 in., non-ferrous metal to 3.125 in., live AC wiring to 2 in.
- Center vs edge find: Zircon MultiScanner i520 OneStep Multifunction Stud Finder center and edge find (4 modes: Stud Scan, DeepScan, Metal Scan, AC Scan) vs Bosch GMS 120 Professional Digital Multi-Scanner automatic center finder for detected objects
- Display type: Zircon MultiScanner i520 OneStep Multifunction Stud Finder backlit LCD display with SpotLite laser-style pointer vs Bosch GMS 120 Professional Digital Multi-Scanner illuminated graphical display
- Calibration method: Zircon MultiScanner i520 OneStep Multifunction Stud Finder automatic via ACT (AutoCorrecting Technology); no manual calibration step vs Bosch GMS 120 Professional Digital Multi-Scanner automatic calibration in each of 3 modes (wood/metal/AC)
- Power source: Zircon MultiScanner i520 OneStep Multifunction Stud Finder 9V alkaline battery (not included) vs Bosch GMS 120 Professional Digital Multi-Scanner 9V battery (included)