What should be ensured about a multimeter when testing electrical safety?

When testing electrical safety, it is crucial that a multimeter is calibrated. Calibration ensures that the device provides accurate measurements, which is vital in environments where precision is essential for safety. An uncalibrated multimeter may give misleading readings, increasing the risk of dangerous situations when working with electrical systems. Regular calibration also helps maintain the reliability of the multimeter for various tests, ensuring that all electrical safety protocols are upheld during inspections and installations. Proper calibration practices instill confidence that the readings taken during testing are valid and trustworthy, allowing technicians to make informed decisions based on those measurements.