Bosch GMS120
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Summary
4.3 stars, 3,400 reviews. The triple-mode detection (stud, metal, AC wire) is the main draw. Metal detection reaches 4.75 inches, farther than any other model here. Centerline indicator helps find the middle. Some users find the mode switching confusing at first, and the stud-only mode is less reliable than the Franklin on standard drywall.
$60-90 Home Depot, Amazon as of April 2026
Key Specifications
| scanDepth | 4.75 in (metal) |
| modes | Stud, metal, AC wire |
| sensors | Multi-sensor |
| display | LED ring + centerline |
| power | 1x 9V battery |
| specialFeatures | Three detection modes |
Pros
- Three detection modes in one unit.
- Metal detection reaches 4.75 inches deep.
- Centerline indicator on stud mode.
- AC wire detection could prevent a dangerous mistake.
- Good on both drywall and plaster.
Cons
- Stud mode alone is less reliable than the Franklin ProSensor.
- Mode switching takes practice.
- Bulkier than simpler models.
- Higher price for the versatility.
- False positives on metal mode near electrical boxes.