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Voltage Testers & Detectors

Voltage testers and detectors let you check for live circuits before you touch anything. Non-contact detectors sense AC voltage through cable sheathing or switch covers — useful for tracing cables in walls or verifying a circuit is dead. Contact testers need direct connection to a terminal or conductor, giving a definite yes/no on whether mains voltage is present. Combination models include stud and metal detection, handy on site when you need to locate joists or pipes before drilling.

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  • 3-in-1 Metal, Voltage & Stud Detector
    Not yet rated
    Sealey
    3-in-1 Metal, Voltage & Stud Detector
    • Detects metal, voltage, studs
    • LED + audible signal display
    • 9V battery supplied
    €45.61 €46.06
    €37.08 €37.45
  • Mains Tester 140mm
    Not yet rated
    Sealey
    Mains Tester 140mm
    • VDE Approved
    • 100-250V testing range
    • Screwdriver blade + pocket-clip
    €3.59 €3.63
    €2.92 €2.95
  • Mains Tester 190mm for electrical voltage testing in construction tools.
    Not yet rated
    Sealey
    Mains Tester 190mm
    • VDE approved mains tester
    • 100-250V testing range
    • Insulated handle + blade sheath
    €6.03 €6.09
    €4.90 €4.95
  • Non-Contact Voltage Detector 80-1000V
    Not yet rated
    Premier
    Non-Contact Voltage Detector 80-1000V
    • 80-1000V range, dual sensitivity
    • LED + audible indication
    • Non-contact detection
    €34.22 €34.56
    €27.82 €28.10

Non-contact detectors work by sensing the electromagnetic field around a live AC conductor. They're quick for checking sockets, light fittings, or following a cable run, but they can't confirm zero voltage — interference or capacitive coupling sometimes triggers a false positive. Use one to flag likely live circuits, then verify with a contact tester or meter if you're isolating for work. Most non-contact models cover 80–1000 V AC; check the rated range matches your typical supply.

Contact testers — the screwdriver-style mains testers here — complete a circuit through your body to a neon lamp or LED. They confirm mains presence reliably but depend on you providing a path to earth, so they won't indicate on floating or incorrectly wired circuits. The 190 mm and 140 mm lengths suit different pocket depths; the longer shaft reaches deeper terminal blocks without your hand crowding the enclosure. Insulation should meet IEC 61243-3 or equivalent; look for a voltage rating stamped on the barrel.

Three-in-one detectors combine non-contact voltage sensing with stud and ferrous-metal detection. The stud mode locates timber joists or battens by sensing density changes; metal mode flags steel conduit, nails, or rebar. Accuracy drops near corners or on lath-and-plaster walls — scan slowly and mark multiple passes. These units suit first-fix work where you're routing cables and need to avoid existing services, but they won't replace a dedicated moisture meter or rebar locator on precision jobs.