Di-Log-Phase-Rotation-Tester-DL9010-Di-Log-DL9010-P-Phase-rotation-meters-or-testers-basically-tell-you-if-the-phasing-is-either-clock-wise-or-counter-clockwise-All-testers-provide-the-same-function-but-depending-on-which-type-of-tester-you-choose-to-purchase-may-make-life-easier-when-testing-electrical-wiring-P-P-The-Di-Log-DL9010-Phase-Rotation-Tester-is-effective-for-measuring-phase-rotation-in-all-areas-where-three-phase-supplies-are-used-to-feed-motors-drives-&-elec