High-accuracy digital multimeters measure DC/AC voltage, current, resistance, and capacitance. Higher-end models add functions for testing frequency (to troubleshoot too low or high Hertz in electronics like speakers), continuity to find open and short circuits between two points, and temperature (using a special thermocouple attachment).

While inexpensive DMMs work well for basic tests on batteries and household electrical fixtures, more sophisticated instruments are better suited for professional and complex tasks. They usually have more advanced features, and are designed to withstand more rugged use with heavier-duty probes and longer life fuses. They may also have more robust safety features like CAT ratings, overload protection and a holster to keep the multimeter handy while working on scaffolding or squeezing into tight spots.

Top High-Accuracy Digital Multimeters for Precision Readings

When evaluating a multimeter, look at the accuracy specification in its manual to get an idea of how close it will read its measurements to the actual value. This number will often be stated as a percentage of full scale, which means that the meter can deviate by that amount from its true value when measuring a very small change in the measured signal, such as an individual digit on the display.

Resolution, the smallest increment the DMM can detect and display, is also an important factor. It’s a little like comparing the clarity of a ruler marked with 1/16-inch hatch marks to one with 1/4-inch hatch marks. The more granular the resolution, the more accurate your readings will be.