rami12 wroteHi;
I once bought one from katranji, it was useless, tested with a multimeter, it should have continuity, and it didn't. search the net to see how to test if it is working or not.
not at all it shouldn't have continuity if it does you will kill yourself if you work with high voltage circuits i previously mentioned that.
anyway it should have somewhere around 1Mohm resistance, set your multimeter to the highest Ohms range and test it again