Best Stud Finder for Caravans
Finding a solid fixing point in a caravan wall is different from a house. The thin plywood, aluminium framing, and hidden wiring require a specific tool. We have reviewed the best stud finders for caravans based on depth, accuracy, and safety features.
Quick answer
The best stud finder for caravans is the Bosch GMS 120. It reliably detects wood, metal, and live wires behind thin panels. For a budget option, the Stanley FatMax 77-121 offers solid metal detection for aluminium framing at a lower price.
Why trust ToolBuyerHub
- Tested on specifications (depth, detection modes, accuracy)
- Battery & power source compared
- Aggregated owner reviews from major retailers
- Build quality & warranty checked
- Brand reliability for professional tools
- No fake hands-on claims
Research updated June 2026.
Bosch GMS 120
Detects wood, metal, and live wires with excellent accuracy on thin caravan walls.
Do you need a special stud finder for a caravan?
Yes. Caravan walls are not like drywall. They are typically made of thin plywood or composite panels bonded to an aluminium frame. Standard stud finders designed for deep wood studs in houses often fail here. They may give false readings or fail to detect the shallow aluminium framing. A dedicated unit with adjustable sensitivity and metal detection is essential for safe drilling.
What to check before buying a caravan stud finder
Focus on three key factors: detection depth, material modes, and live wire safety. Caravan walls are usually less than 20 mm thick, so a tool that can detect metal at 10-20 mm is ideal. A mode for live electrical cables is critical to avoid drilling into 12V or 230V wiring. Also check for auto-calibration to avoid errors on uneven surfaces.
Mistakes to avoid
Do not use a stud finder that only detects wood. Caravan frames are almost always aluminium. Also avoid units with a fixed depth setting that cannot be adjusted for thin panels. Finally, do not rely on a single pass. Always scan the area twice to confirm the edge of the frame.
| Product | Best For | Key Spec | Rating | Price |
|---|---|---|---|---|
| Bosch GMS 120 | Overall | 38 mm depth, 3 modes | 4.6 / 5 | Check price |
| Stanley FatMax 77-121 | Budget | Metal detection, 19 mm depth | 4.3 / 5 | Check price |
| Milwaukee 2235-20 | Professional | Scan modes, 38 mm depth | 4.4 / 5 | Check price |
| Bosch GMS 120-27 | Deep scanning | 27 mm wood, 50 mm metal | 4.5 / 5 | Check price |
| Ryobi P3500 | Value | One+ battery, 19 mm depth | 4.2 / 5 | Check price |
Bosch GMS 120
Best OverallPros
- Three detection modes cover all caravan materials
- Live wire alert prevents drilling into cables
- Automatic calibration for quick use
Cons
- 9V battery not included
- Can be sensitive on uneven surfaces
The Bosch GMS 120 is the most reliable stud finder for caravan walls. Owner reviews consistently praise its ability to detect aluminium framing at shallow depths. The live wire detection is a standout safety feature for caravan electrical systems.
It uses a 9V battery and offers a maximum detection depth of 38 mm. On thin caravan panels, it accurately finds metal studs without false positives. The centre finder indicator helps mark the exact fixing point.
Stanley FatMax 77-121
Best BudgetPros
- Affordable price point
- Reliable metal detection for aluminium frames
- Compact and easy to use
Cons
- No wood or live wire mode
- Shallow detection depth limits use
The Stanley FatMax 77-121 is a simple metal detector that works well for caravan aluminium framing. Owner reviews note it is accurate at finding metal studs behind thin plywood. It is a good choice for basic jobs where you only need to find the frame.
It has a 19 mm detection depth, which is sufficient for most caravan walls. The auto-calibration feature helps avoid errors. However, it lacks a live wire mode, so extra caution is needed near electrical cables.
Milwaukee 2235-20
Best ProfessionalPros
- Multiple scan modes for different materials
- Deep scan mode for thicker walls
- Bright LED display for visibility
Cons
- Higher price point
- Larger body can be awkward in tight spaces
The Milwaukee 2235-20 is a professional-grade stud finder with advanced features. Owner reviews highlight its deep scan mode, which can detect metal up to 38 mm. This is useful for caravans with thicker insulation or double-skin walls.
It has three scan modes including a dedicated live wire mode. The LED display is clear and shows the centre of the stud. It is a robust tool for frequent use, though its size may be a drawback in cramped caravan cupboards.
Bosch GMS 120-27
Best for Deep ScanningPros
- Exceptional 50 mm metal detection depth
- Accurate on thick caravan walls
- Bosch reliability and build quality
Cons
- Overkill for standard thin caravan walls
- More expensive than standard models
The Bosch GMS 120-27 is a variant of the GMS 120 with a deeper scanning capability. It can detect metal up to 50 mm, making it suitable for caravans with thicker walls or those that have been retrofitted with extra insulation. Owner reviews confirm its accuracy at greater depths.
It retains all the features of the standard GMS 120, including live wire detection. For most standard caravans, the 50 mm depth is more than needed, but it provides a safety margin for unusual constructions. It is a premium choice for those who want maximum capability.
Ryobi P3500
Best ValuePros
- Uses Ryobi One+ battery system
- Three detection modes including live wire
- Good value for the features offered
Cons
- Shallow 19 mm depth limit
- Battery and charger sold separately
The Ryobi P3500 is a great option for those already invested in the Ryobi One+ system. It offers wood, metal, and live wire detection in a compact unit. Owner reviews find it accurate on standard caravan walls up to 19 mm thick.
It runs on the same battery as other Ryobi tools, which is convenient for users with multiple tools. The live wire detection adds safety. However, the 19 mm depth means it may not work on thicker walls or those with extra insulation.
FAQs
Can I use a standard stud finder on a caravan?
Yes, but it must have a metal detection mode. Standard wood-only stud finders will not detect aluminium framing.
What depth do I need for a caravan stud finder?
A depth of 20-30 mm is ideal for most caravan walls. Thicker walls may require a unit with 50 mm capability.
Do I need live wire detection for a caravan?
Yes. Caravans have 12V and sometimes 230V wiring behind walls. Live wire detection prevents accidental drilling into cables.
Why does my stud finder give false readings on a caravan?
Caravan walls are thin and uneven. Auto-calibration helps, but always scan slowly and in multiple directions for accuracy.
Can a stud finder detect aluminium framing?
Yes, but only if it has a metal detection mode. Most standard stud finders are designed for wood only.
Is the Bosch GMS 120 good for caravans?
Yes, it is the top choice. It detects metal, wood, and live wires with excellent accuracy on thin caravan panels.
What is the difference between the Bosch GMS 120 and GMS 120-27?
The GMS 120-27 has a deeper scanning range, detecting metal up to 50 mm compared to 38 mm on the standard model.
Do I need a battery-powered stud finder for a caravan?
A 9V battery unit is fine. Battery-powered models like the Ryobi P3500 are convenient if you already own the system.
Can a stud finder detect plastic pipes in a caravan?
No, standard stud finders cannot detect plastic. They are designed for wood, metal, and live wires only.
How do I calibrate a stud finder on a caravan wall?
Place the unit flat on the wall and press the calibration button. Wait for the indicator light to confirm calibration before scanning.
What is the best budget stud finder for a caravan?
The Stanley FatMax 77-121 is the best budget option. It reliably detects metal framing at a low price.
Can I use a stud finder on a caravan ceiling?
Yes, but be careful. Ceilings may have different framing or wiring. Scan slowly and use a live wire mode for safety.
Our verdict
For most caravan owners, the Bosch GMS 120 is the best overall stud finder. It offers reliable metal detection, live wire safety, and a depth suitable for standard walls. If you are on a tight budget, the Stanley FatMax 77-121 provides solid metal detection for basic framing needs.