Test equipment set for checking the electrical safety of devices, particularly for three-phase devices including welding machines, along with data processing software IZYTRONIQ. The test equipment set includes SECUTEST ST PRO for testing electrical devices, medical devices, and welding machines - both with predefined and optionally programmable test sequences, which are necessary according to the latest testing standards DIN EN 50678 (VDE 0701), DIN EN 50699 (VDE 0702), IEC/EN 62353 (VDE 0751), and IEC/EN 60974-4 (VDE 0544-4). The set is particularly suitable for testing tasks on three-phase devices, including arc welding equipment, and includes all necessary three-phase adapters up to 32A as well as a peak value rectifier for measuring open-circuit voltage. Protocol generation in HTML on USB storage. Maintenance and repair of three-phase devices, including arc welding equipment. Optional feature package DB-Comfort. 1x SECUTEST ST PRO, 2x SORTIMO L-BOXX plastic system cases, 2x foam inserts, 1x AT16-DI adapter, 1x SECULOAD-N test adapter, 1x adapter cable CEE16A, 1x IZYTRONIQ BUSINESS Professional.