Best Cable Detector Under £30
Finding a live wire or metal pipe behind plasterboard shouldn't cost a fortune. We've analysed specs, owner reviews, and brand reliability to find the best cable detector under £30 that actually works.
Quick answer
The Bosch Truvo is the best cable detector under £30 for its fast live-wire detection and auto-calibration. For a cheaper option with metal detection, the Stanley S100 is a solid alternative that costs less but still finds studs and cables reliably.
Why trust ToolBuyerHub
- Tested on specs (depth range, detection modes)
- Battery & ecosystem compared
- Aggregated owner reviews from major retailers
- Build quality & warranty checked
- Brand reliability (Bosch, Stanley, Draper)
- No fake hands-on claims
Research updated June 2026.
Bosch Truvo
Fast and accurate live-wire detection with auto-calibration
| Product | Best For | Key Spec | Rating | Price |
|---|---|---|---|---|
| Bosch Truvo | Best overall | 50 mm live wire depth | 4.5 / 5 | Check price |
| Stanley S100 | Best budget | 19 mm metal detection | 4.2 / 5 | Check price |
| Draper 67836 | Best for studs | 18 mm AC wire depth | 4.0 / 5 | Check price |
| Bosch PMD 7 | Best multi-material | 70 mm metal depth | 4.3 / 5 | Check price |
| Sealey MM12 | Best for pipes | 38 mm metal depth | 3.9 / 5 | Check price |
Bosch Truvo
Best OverallPros
- Fast auto-calibration on any surface
- Clear LED and audible alert for live wires
- Compact and lightweight design
Cons
- No stud-only mode
- Battery not included
The Bosch Truvo is the most popular cable detector in its price range for good reason. It automatically calibrates when placed on a wall, so you don't need to hold a button or adjust settings. Owners report it reliably finds live AC wires up to 50 mm deep, which is enough for most plasterboard and thin masonry walls.
It also detects ferrous and non-ferrous metals at 30 mm depth, though some users note it can beep on metal pipes when looking for cables. The single-button operation makes it easy for beginners, and the build quality matches Bosch's reputation for durability. The only real downside is the lack of a dedicated stud detection mode, but for live-wire finding under £30, it's hard to beat.
Stanley S100
Best BudgetPros
- Very affordable price point
- Three detection modes for versatility
- Simple two-button operation
Cons
- Shallow detection depth compared to others
- Some false positives on damp walls
The Stanley S100 is the cheapest reliable cable detector on this list, making it ideal for occasional DIY tasks. It offers three modes: AC wire detection, metal detection, and stud detection, which gives it more versatility than the Bosch Truvo. Owners say it works well on standard drywall and plasterboard, finding live cables at 13 mm depth and metal pipes at 19 mm.
However, the detection depth is shallower than the Bosch Truvo, so it may miss cables buried deeper in masonry walls. Some users also report occasional false alerts on damp or uneven surfaces. But for under £15, the Stanley S100 delivers good value if you only need basic detection for light home projects.
Draper 67836
Best for StudsPros
- Good stud detection accuracy
- Clear LCD display with depth indication
- Ergonomic grip design
Cons
- Slower calibration than Bosch
- Build quality feels less premium
The Draper 67836 is designed for users who need reliable stud detection alongside cable finding. It has a dedicated stud mode that finds wooden and metal studs up to 18 mm deep, which owners find accurate on standard drywall. The LCD screen shows the detection depth, helping you understand what's behind the wall.
It also detects AC wires at 18 mm and metal pipes at 38 mm, making it a versatile tool for electrical and plumbing work. Some users note that the auto-calibration takes a few seconds longer than the Bosch Truvo, and the plastic housing feels less robust. But for stud-focused DIYers, it's a capable detector under £30.
Bosch PMD 7
Best Multi-MaterialPros
- Deep metal detection up to 70 mm
- Three modes for different materials
- Bosch build quality and reliability
Cons
- More expensive than other budget options
- Can beep on rebar in concrete
The Bosch PMD 7 is a step up in detection depth, offering 70 mm for metal and 50 mm for live wires. This makes it suitable for thicker walls and masonry where cables may be buried deeper. Owners appreciate the three detection modes: metal, live wire, and stud, which cover most DIY scenarios.
It's slightly more expensive than the Truvo but still under £30 if you shop around. Some users note that it detects rebar in concrete walls, which can cause false alerts when looking for pipes. However, the deeper detection range and Bosch reliability make it a strong choice for more demanding projects.
Sealey MM12
Best for PipesPros
- Good metal pipe detection depth
- Three modes for versatility
- Affordable price
Cons
- Less accurate on live wires
- Build quality feels basic
The Sealey MM12 is a budget-friendly detector that excels at finding metal pipes up to 38 mm deep. Owners who work on plumbing projects find it reliable for locating copper and steel pipes behind plasterboard. It also detects AC wires at 18 mm and studs, making it a decent all-rounder for the price.
However, some users report that the live wire detection is less accurate than the Bosch Truvo, with occasional false positives on non-live metal. The build quality is basic, with a plastic housing that feels less durable than Bosch or Stanley models. But for pipe-focused DIY tasks, the Sealey MM12 offers good value under £30.
What to check before buying a cable detector under £30
Not all cable detectors are the same. Here are the key factors to consider before you buy.
Detection depth. Most budget detectors find live wires at 13-50 mm depth. For standard drywall, 18 mm is enough. For masonry or thicker walls, look for 50 mm or more.
Detection modes. Basic models only detect live AC wires. Better ones add metal and stud modes. If you need to find pipes or studs, choose a multi-mode detector.
Auto-calibration. This feature simplifies use by automatically adjusting to the wall surface. Manual calibration models are cheaper but require more effort.
Battery type. Most use a single 9V battery. Check if it's included in the box, as some brands don't supply one.
Brand reliability. Bosch, Stanley, and Draper have good reputations for accuracy and durability. Lesser-known brands may save money but often have poorer reviews.
Mistakes to avoid when using a cable detector
Even a good detector can give false results if used incorrectly. Avoid these common errors.
Skipping calibration. Always calibrate on the same surface you're scanning. Moving the detector too fast or on a different wall can cause false readings.
Ignoring metal detection. Live wire mode only finds active cables. If you're drilling near pipes or old wires, switch to metal mode to find everything.
Not checking for rebar. In concrete walls, rebar can trigger metal detection. Mark all alerts and check with a stud finder if unsure.
Assuming 100% accuracy. No budget detector is perfect. Always drill slowly and check for resistance. If in doubt, use a cable avoidance tool (CAT) for professional work.
FAQs
How deep can a cable detector under £30 find wires?
Most budget detectors find live AC wires at 13-50 mm depth. The Bosch Truvo reaches 50 mm, while the Stanley S100 finds wires at 13 mm.
Can I use a cable detector on plasterboard?
Yes, most cable detectors work on plasterboard and drywall. Auto-calibration models like the Bosch Truvo adjust to the surface automatically.
Do cable detectors find metal pipes?
Yes, if the detector has a metal detection mode. The Sealey MM12 and Bosch PMD 7 both find metal pipes up to 38-70 mm deep.
What battery do these detectors use?
All the detectors on this list use a single 9V battery. Some brands include it, others do not, so check the box.
Are Bosch cable detectors better than Stanley?
Bosch generally offers deeper detection and faster calibration. Stanley models are more affordable but have shallower depth and fewer features.
Can a cable detector find wires in concrete?
Yes, but depth is limited. The Bosch PMD 7 finds metal up to 70 mm in concrete, but rebar can cause false alerts.
Do I need a stud finder or cable detector?
If you're drilling near electrical cables, a cable detector is essential. A stud finder only finds wood or metal studs, not live wires.
How accurate are budget cable detectors?
They are generally accurate for live wires and metal at stated depths. False positives can occur on damp walls or near rebar.
Can I use a cable detector for plumbing?
Yes, if it has metal detection mode. The Sealey MM12 and Bosch PMD 7 are good for finding copper or steel pipes.
What is the best cable detector under £30 for DIY?
The Bosch Truvo is the best all-rounder for its fast live-wire detection and auto-calibration. For budget buyers, the Stanley S100 is a solid alternative.
Our verdict
The Bosch Truvo is the best cable detector under £30 for its fast auto-calibration, reliable live-wire detection up to 50 mm, and Bosch build quality. For budget-conscious buyers, the Stanley S100 offers good value with three detection modes at a lower price. Both are safe choices for DIY drilling projects.