How to choose
Choose a detector by wall construction and object type while keeping false-negative limits visible.
Quick answer
A detector is one check, not permission to drill. Match the sensing technology and documented depth to the wall and target, then combine it with plans, visible service routes, isolation and cautious verification.
Scope: A detector or meter reading is supporting evidence, not clearance to drill, cut, energise or diagnose a building defect.
Four options to compare
Best for: Supported drywall where locating framing or metal is the main job.
Main trade-off: Depth, moisture, foil, mesh and wall construction can create missed or ambiguous results.
Must check: Supported wall type, scan directions, calibration and manual limitations.
Best for: Adding another warning layer before work near likely electrical routes.
Main trade-off: A non-live, screened, deep or poorly oriented cable may not be indicated.
Must check: Isolate where appropriate and never interpret no signal as proof of no cable.
Best for: More complex walls or a need to distinguish supported object types and depths.
Main trade-off: Higher price and more information do not eliminate interpretation errors.
Must check: Exact detectable objects, maximum depths and wall/material exclusions.
Best for: Critical drilling, unclear construction or consequences that exceed a detector’s evidence.
Main trade-off: This takes longer and may carry an added cost.
Must check: Use a competent route when the wall cannot be made sufficiently certain.
Trace sockets, switches, radiators and pipe routes; check drawings where available; isolate relevant circuits; scan in more than one direction; and stop when readings conflict.
Documented object types and limitations differ materially. UK Shortlists withholds a definitive safest detector claim until controlled false-negative testing is available.
What this guide cannot check
Do not claim universal safety, guaranteed suitability, professional approval or permission to undertake protected work. Check current instructions, exact identifiers and local circumstances before acting.