Testing of three-phase extension cables including testing of the phase position. The test adapter is designed for measuring and testing electrical devices and extension cables with CEE plugs and sockets in conjunction with test devices in accordance with the following regulations: DIN VDE 0701-0702 (testing after repair and repeat tests). The adapter can be used to test the following variables in conjunction with test devices designed for these tests: on electrical devices protective conductor resistance insulation resistance (measurement L1/L2/L3 and N short-circuited to PE) equivalent leakage current on extension cables protective conductor resistance insulation resistance (measurement L1/L2/L3 and N short-circuited to PE) function test on single-phase and three-phase extension cables for wire continuity, short-circuit and reverse polarity (clockwise rotating field) - simply by measuring the insulation resistance using a rotary switch. 1 test adapter VL2 E 1 operating manual 1 plug adapter according to EN 60320 C13 to C6 (cold devices 10 A to 2.5 A IBM plug)