The test equipment used can have a significant impact on measurements. In most cases, the difference will be due to input power measurement. The accuracy of the input power measurement is dependent on the power factor of the unit under test, as well as the base accuracy of the measuring equipment. If all equipment and setups were identical, it is still possible to have a difference in readings of twice the stated accuracy. For example, if a power analyzer has an accuracy of ± 0.1%, the worst-case difference could be as much as 0.2%. The Hioki PW6001 power analyzer used by 80 PLUS^® has an Active power base accuracy of ± 0.02% of the reading plus 0.03% of the range + current sensor accuracy, and the Yokogawa WT5000 has a base accuracy of ± 0.01% of the reading + 0.02% of the range.