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The VDE-tester TV 455 is a professional, multi-functional, portable test instrument for the implementation of all measurements for the comprehensive inspection of electrical installations in buildings. The following measurements and tests can be performed:Voltage and frequency- Continuity testsTesting of the insulation resistance- Residual current testingThe Fault loops/RCD Trigger blocking impedance measurementLine impedance/voltage drop-Phase SequenceIn addition, the earthing resistance test.The graphical display with background lighting offers an easy reading of the results, instructions, measurement parameters and messages. Two good/poor LED-displays are arranged on the sides of the LCD display.This text is machine translated.