Past surprised to receive a box with lots of Chinese inscriptions above, the initiation of this tester is very simple. It is impossible to go wrong connection because the connectors will light where you must connect the test probes. The auto-range wonders and the backlight of the display is very useful. The plethora of functions necessary for any electronics is present, test transistors, continuity (sound), diodes, capacitors (with included adapter) etc ... Only flaws: an English documentation and the inability to attach the extension block (for measuring capacitors and transistors) to the device. We risk losing it.