Fluke 1550C/1550C FC High-Voltage Insulation Tester for Electrical Diagnostics Professional Electrical Diagnostic Instrument The Fluke 1550C/1550C FC High-Voltage Insulation Tester is a professional electrical diagnostic instrument designed to help maintenance teams evaluate insulation conditions and support reliable operation of critical electrical systems. Built for demanding industrial environments, this advanced testing solution provides technicians with a practical way