Megger TTRU1-Basic 1Ø handheld turns ratiometer - 37.5 VAC37. 5 VAC induced handheld turns ratiometer test set with 2m (6ft) H and X Leads The TTRU1 is the latest handheld transformer turns ratiometer from Megger. In addition to routine polarity validation and turns ratio tests, the TTRU1 can measure short circuit impedance (leakage reactance) with the same one time connection. Guided by color coded leads, clamps, and customisable on screen vectors that match the transformer nameplate under test, the easy to