But a new technique for measuring ohms, known as the quantum anomalous Hall effect (QAHE), makes the combination of these two devices possible. Each device would be tested with a separate cryostat—a device for maintaining the seriously cold temperatures necessary for calibration. In a new paper published in the journal , scientists at NIST successfully developed an all-in-one, four-square-meter device that can calibrate ohms, amperes, and volts at the same time. This strong magnetic field for testing the ohm is why scientists have previously failed to create an all-in-one calibration device. This “Swiss army knife for electrical standards,” as NIST calls it, could finally allow scientists to calibrate instruments in their own laboratories to international standards.