100pcs 1N4742 1N4742A 1W 12V dip zener diode

okay in this video I'll show you how how to test one of these one of these diodes to to find out what the voltage and what I have here basically is I this is a 3-cell battery pack and it is wired to a 1k resistor one can resist on the positive lead and then I also have a black wire on the black coming from the battery and those two wires dread one having the 1k resistor in the black one straight they go to my multimeter and I've simply put the black wire around the black oh this black lead on the multimeter and the red wire on the right same thing as you can see okay so when I turn on the multimeter it gives me I put it on two hundred twenty twenty volts and it gives me the reading of the battery back eleven point three four right now and now what I'll do is simply I'll pick up these two this one and this one and I'll touch with this one on the negative side of the diode which is this t