Megger TTRU1-ADV 1Ø handheld turns ratiometer - 62.5 VAC62. 5 VAC induced handheld turns ratiometer and go no go impedance test set with customizable vector lists, guided three phase tests, and PowerDB import 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 colour coded leads,