Question

how to make a tester

Answer 1

well,all wou need is:

-some electrical tape
-a button cell battery
-a i/d cable thing with holes in it ( i don't know how it's called)
-an LED for testing...
the materials...:
step-2
-some scissors
-a wire cutter/stripper
-a hot glue gun
step-3
strip both wires of the cable thing and hold it on the side of the button cell battery,with one wire touching one side and the other wire touching the other side
step4
cut some electrical tape and put it touching both,wire and one side of the battery and same thing on the other side
step5
well,you're pretty much done...

all you have left is to write a + and - on each side of the battery (on the electrical tape),respecting the actual + and -

if wou find that the holes are too loose,you can use some hot glue to fix it