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FAQs

A circuit tester probe lamp gives a simple yes/no indication of voltage presence — a small lamp (or LED) lights when the probe contacts a live circuit at the rated voltage (6V/12V/24V variants). Fast for live/dead checks but no measurement. A multimeter measures actual voltage, current, and resistance values — slower to use but gives quantitative data on circuit condition (e.g., 11.8V on a battery indicates partial discharge; 12.6V indicates full charge). Most workshops use both — probe lamp for fast diagnosis, multimeter for measurement.

Safety category ratings cover the energy level the tester is designed to handle safely. CAT II: receptacle-fed equipment (typical household appliances, low-energy circuits). CAT III: distribution-level circuits (mains supply within a building, fixed-installation wiring). CAT IV: source-level circuits (incoming mains, supply transformers, outdoor installations). For automotive and plant electrical work under 50V, CAT II is acceptable; for any work involving 230V or higher, CAT III minimum; for industrial mains-supply work, CAT IV. The category rating is on every multimeter product page.

Two-stage test: (1) battery state — measure battery voltage with engine off (typical 12.4-12.7V on a healthy 12V battery); (2) charging output — start the engine and measure across battery terminals at idle and at 1,500 RPM (typical 13.8-14.4V on a healthy 12V system; 27.6-28.8V on 24V). Below the rated voltage indicates a charging fault (alternator, regulator, or wiring); significantly above indicates a regulator fault that risks battery damage. Specialist charging-system testers automate this with load profiles and report battery-and-alternator condition together.

Yes. Workshop oscilloscopes (typically 2-channel digital storage scopes with 20-100 MHz bandwidth) are available for sensor signal diagnosis, ignition-pattern analysis, fuel-injector waveform check, and CAN-bus and other digital-signal diagnostic work. Specifically-automotive scopes have pre-set test profiles and probe sets for the common automotive signals; general-purpose digital scopes cover the full range with appropriate probes. For trade workshops doing modern-vehicle diagnostic work, an oscilloscope is increasingly essential. WhatsApp 07754288583 for application-specific advice.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and "Check where we deliver" confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Within Electricals & Lighting, Testers covers the workshop test instruments used in vehicle electrical service, plant equipment electrical diagnosis, and general workshop electrical testing — covering circuit testers and probe lamps, multimeters, oscilloscopes, battery testers, charging-system testers, fuel-injection testers, and the wider range of diagnostic instruments used in trade workshop electrical service.

Parts for Machines supplies workshop testers across the trade and professional ranges, covering both general-purpose test instruments and specialist diagnostic equipment for specific applications (battery test, charging-system test, fuel-system test, sensor diagnosis).

We are an authorised distributor and seller of SIP, Sealey, and Draper across the tester range. Sealey and SIP cover the broadest selection — circuit testers and probe lamps in 6V/12V/24V variants, multimeters across hobby through trade-grade with category-rated safety, battery testers using conductance and load-testing methods, and the diagnostic test equipment used in commercial-vehicle and plant equipment service. Draper extends the range with workshop and home-shop variants.

Product pages list the tester type (circuit tester, multimeter, battery tester, charging tester, etc.), the operating voltage range, the measurement specifications (range, accuracy, resolution where applicable), the safety category rating (CAT II / III / IV — relevant where the tester is used on mains and high-energy circuits), the supply (battery-powered or mains-supplied), the connection style (probe leads, alligator clips, insulated cable), and the included accessories. For workshop electrical service, a layered tester set covers most diagnostic work: a probe-lamp circuit tester (instant 12V/24V circuit live/dead check), a multimeter (voltage, current, resistance, continuity), a battery tester (CCA and state-of-charge), and a charging-system tester (alternator output, voltage regulation). Specialist applications (fuel-injection diagnosis, sensor signal analysis, oscilloscope work) require dedicated equipment. Trade pricing on multi-tool and workshop-kit orders is available; contact the team via WhatsApp 07754288583.

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