Plus meter

Choose the plus meter category when you need a handheld device for measuring electrical parameters like current, voltage, resistance, and temperature. Look for models that cover AC and DC measurements, offer true RMS for accurate readings, and provide a wide current range. Check safety ratings (CAT II–CAT IV), display readability, auto-ranging, and included accessories such as probes or clamps. Consider the environment you’ll work in and whether you need features like data logging or a backlit display.

The most complex attribute to understand is the measurement range and the safety rating for current and voltage on a plus meter. True RMS capability matters for accurate readings on non-sinusoidal signals, while auto-range makes operation easier by adjusting the scale automatically. Check the maximum current and voltage the tool supports and its CAT safety category to match your working environment. Also verify the stated accuracy and how it behaves with accessories like clamps and probes.

Beginners should start with a plus meter that features auto-ranging, a large display, and simple prompts. Professionals typically require higher accuracy, true RMS, more measurement modes, and rugged build for daily use. Evaluate your typical tasks—home voltage checks vs. professional diagnostics—to decide which features matter most. Choose a model that balances ease of use with the precision and durability needed for longer-term reliability.

Store the plus meter in a dry place and remove batteries if it will be unused for long periods. Keep test probes and clamps clean, undamaged, and properly stored to avoid inaccurate readings. Regularly inspect safety ratings, calibrate or have it calibrated if required by local standards, and ensure probes match the measurement ranges. Check compatibility with accessories and safety standards to ensure safe use in your environment.

Choose brands with a track record in handheld electrical testers when shopping for a plus meter. Look for recognized series within brands like Uni-T that offer true RMS, auto-ranging, broad measurement ranges, and durable housings. Consider warranty terms and the availability of compatible probes and clamps, as well as clear safety documentation. Avoid very cheap, unbranded options that lack confidence-inspiring safety details.