multimeter to test your guitar/bass pickups without taking the instrument apart.
I have a website with videos and more info at...
This tester also can be used to test speakers that are sealed inside a cabinet,
so that you will know the exact Ohm readings with out having to take the cabinet apart.
Step 1: Tools and Material
a 1/4" guitar cord jack,
a pair of wire strippers,
a soldering iron,