The extra small and handy loop impedance tester MZC-304 F from Sonel is designed for loop measurements of ZL-PE, ZL-N, and ZL-L in 230/400V networks. The test current varies depending on the network voltage between 7.6 A and a maximum of 13.3 A. Measurement of the impedance ZL-PE is also possible without tripping the RCD. Tests can be conducted using both measuring leads and the handy UNI protective contact adapter. With extensive measuring accessories, measurements can also be carried out in 3-phase networks. Additional measurements such as AC voltage, frequency, or resistance of the protective conductor can be wirelessly transmitted to and evaluated on a PC via the OR-1 adapter. The device is intended for personnel conducting measurements in single and multi-family homes, offices, industrial facilities, and all other locations with a low-voltage installation. Furthermore, the measuring device is designed for maintenance personnel in facilities where short-circuit currents reach 4.4 kA (measurements according to EN 61557). The MZC-304 F is also the perfect tool for testing circuits where an additional protective device in the form of residual current circuit breakers is used.