Final answer:
A multimeter is a suitable QA tool to evaluate mA output or pentrometer. Using a digital multimeter that is more sensitive can improve the accuracy of null measurements.
Step-by-step explanation:
In order to evaluate the mA output or pentrometer, a Quality Assurance (QA) tool called a multimeter can be used.
A multimeter is a versatile tool that can measure various electrical quantities, including mA (milliamperes). By connecting the multimeter in series with the circuit, it can accurately measure the mA output or pentrometer.
Using a digital multimeter that is more sensitive than a galvanometer can improve the accuracy of null measurements. The higher sensitivity allows for more precise measurements, reducing the chances of errors and providing more accurate results.