Voltage, continuity & circuit testers for electrical diagnosis

This collection brings together purpose-built voltage testers, circuit testers, non-contact voltage detectors and continuity testers for electrical fault finding, maintenance and automotive electrical work. The range is intentionally focused on instruments that indicate or verify an electrical condition; it does not replace the broader measurement capability of a multimeter or clamp meter. Use it to choose a tester by the system type, stated voltage range, method of indication and application—not simply by probe style.

Live products include specialist options from SP Tools, Kincrome, Klein Tools, Wiha, Milwaukee, Stahlwille, Toledo, Sykes-Pickavant, Teng, Rytool, 888 Tools and other current brands. Many are designed around low-voltage vehicle and workshop systems, while others are intended for electrical installation and general voltage detection. Always read the exact product instructions and rating before selecting an instrument.

Choose the correct tester

Voltage and non-contact detectors

Voltage testers and non-contact detectors can indicate the presence of a voltage condition within their published range. They are useful for preliminary checks and selected service tasks, but they are not a substitute for a complete approved isolation and proving procedure. Check the stated AC/DC capability, voltage range, measurement category and application suitability.

Continuity testers

Continuity testers help establish whether an electrical path is complete. They are useful for tracing wiring and checking selected circuits when used according to the manufacturer’s method. They do not assess every electrical fault or replace insulation, resistance or load testing where those measurements are required.

Automotive circuit testers

Automotive circuit testers are built for vehicle and workshop diagnostic work, often across 6 V, 12 V, 24 V or wider DC ranges. Compare the stated vehicle-system range, probe length, display type, computer-safe specification and the manufacturer’s guidance for modern vehicle electronics. A tester suited to an automotive circuit should not be assumed suitable for mains electrical work.

Safety and correct use

Use a tester only within its published voltage range, category and environment. Inspect the housing, lead, probe, insulation and battery condition before use. Follow your site isolation, lock-out and proving procedures; do not treat a single test result as proof that a circuit is safe unless the approved method requires and supports that conclusion. Where a task is outside the instrument’s stated capability, move to an appropriate Digital Multimeter or Clamp Meter or obtain competent electrical advice.

Related electrical ranges

For broader electrical measurement, shop Digital Multimeters & Clamp Meters. For the parent range, return to Electrical Test & Measurement. When repair work also requires wiring tools, use Cable Cutters & Wire Strippers and Electrical Crimping Tools & Dies.

Frequently asked questions

Can a voltage tester prove a circuit is isolated?

Not by itself. The right test method depends on the installation, equipment and site procedure. Follow the approved isolation and proving process and use a suitable instrument within its stated rating.

Can I use a vehicle circuit tester on mains electrical work?

No. Automotive circuit testers are designed for their stated low-voltage applications. Mains electrical work needs an instrument and procedure appropriate to the voltage, measurement category and environment.

What is the difference between continuity and voltage testing?

Continuity checks whether a path is complete, while voltage testing checks for the presence or level of voltage. These answer different questions and may require different instruments. Read the product instructions before using either method.

Industrial Shed can help match a live tester to the system, voltage range and diagnostic task. For trade and project enquiries, provide the equipment type and the test you need to perform.