Precision power measurement is essential for evaluating modern power electronics and electric drivetrains. At productronica 2025, we showcased the LMG671 from ZES ZIMMER, now part of Rohde & Schwarz, delivering 0.025 percent accuracy with up to 7 voltage and current channels. Its dual-path architecture supports narrowband and wideband analysis, and the customizable GUI brings key measurement values into one view. Our motor demo setup shows how the LMG671 measures input and output power, efficiency, and mechanical parameters such as speed and torque.