Can all expensive digital meters measure DC microamps as low as 0.1 µA?

The assertion that not all expensive digital meters can measure DC microamps as low as 0.1 µA is valid. While many high-quality digital multimeters are designed to handle a wide range of measurements, including low-level DC currents, specifics can vary significantly between models and their intended applications.

Most digital multimeters have a specified range for current measurement, and for most traditional models, the minimum current they can accurately measure is often above 0.1 µA. Even within the category of expensive multimeters, some may prioritize other features or measurement capabilities, leading to limitations in their current ranges.

Moreover, the technology used in the design of the multimeter can affect its performance at low measurements. Instruments that are capable of such fine resolutions typically have specialized circuitry and ranges specifically designed for that purpose, which may not be present in all high-end models. Therefore, while some expensive digital meters do possess the capability to measure such low currents, it is not a universal feature across all such devices.