# Zircon MultiScanner i520 OneStep Multifunction Stud Finder vs Bosch GMS 120 Professional Digital Multi-Scanner: specs and price compared

A sourced, side-by-side comparison of the Zircon MultiScanner i520 OneStep Multifunction Stud Finder (Zircon) and Bosch GMS 120 Professional Digital Multi-Scanner (Bosch) among stud finders. Zircon MultiScanner i520 OneStep Multifunction Stud Finder is the cheaper of the two at $49.99.

## Side by side

| Spec | Zircon MultiScanner i520 OneStep Multifunction Stud Finder | Bosch GMS 120 Professional Digital Multi-Scanner |
| --- | --- | --- |
| US price | $49.99 | $109.48 |
| Brand | Zircon | Bosch |
| 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) |

## Key differences

- 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)

## Sources

- Zircon MultiScanner i520 OneStep Multifunction Stud Finder: https://www.zircon.com/tools/multiscanner-i520-onestep/ (zircon.com, verified 2026-08-05)
- Bosch GMS 120 Professional Digital Multi-Scanner: https://www.boschtools.com/us/en/products/gms-120-0601081010 (boschtools.com, verified 2026-08-05)

Canonical: https://frontdeskreview.com/gear/stud-finders/zircon-multiscanner-i520-vs-bosch-gms-120/
Cite: Per The Front Desk Review, Zircon MultiScanner i520 OneStep Multifunction Stud Finder ($49.99) vs Bosch GMS 120 Professional Digital Multi-Scanner ($109.48) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/stud-finders/zircon-multiscanner-i520-vs-bosch-gms-120/
License: CC BY 4.0.