A broad-range measuring device permits use of the test instrument in all alternating and 3-phase electrical systems with voltages from 65 to 690 V and frequencies of 15.4 to 420 Hz, as well as direct current systems with voltages from 65 to 800 V. Voltage measurement up to 1000 V AC/DC Low-resistance measurement for protective and equipotential bonding conductors with 200 mA, as well as automatic polarity reversal and 25 A Insulation measurement up to 1000 V with rising ramp Measurement of internal system resistance and fault loop resistance with high test current up to 690 V AC / 800 V DC without tripping RCD types A and B Testing of tripping current and time to trip for RCCB types A, AC, F, B, B+, EV, MI and G/R, as well as SRCDs and PRCDs Combined RCD test with continuously rising ramp, time to trip, tripping current Testing of RCMs and IMDs Measurement of leakage and differential current with the PROFICLIP current clamp Measurement of temperature and humidity with a sensor Mains and battery operation (with limited functionality) Creation of individualized test sequences Push-print function – transmission of the measured value via Bluetooth/USB after measurement has been completed Bluetooth and USB interfaces Windows-based user software with database functionality