The test leads on my multimeter are too large to fit in the holes in my breadboard. How can I easily connect my multimeter to test voltage on my breadboard?
Use alligator clips for your DMM test leads and pin it on the leads of your breadboard wires ( terminals) where you want to test.
Please see the below picture to understand what I am trying to say.
Please for heaven's sake don't try forcing those test lead pins into the breadboard holes, they damage the copper strip inside (personal experience.)
You could either make some leads up, with banana jack on one end (available from any decent electronics vendor) and header pin, crocodile clip, or similar on the other.
Or do what I have done many times and just grab a bit of solid core wire (of a size suitable from breadboard), strip at both ends, wrap one end a few times around the test probe with needle nose pliers and stick the other end in the breadboard.
Lacking any alligator clips in my collection (I need to rectify that oversight) I managed to use elastic bands to connect two pieces of metal together. Where one piece of metal was a wire attatched to my breadboard and the other was the DMM pin:
It actually worked really well. The trick is to tie the rubber band in a slip knot so that you can pull it as tight as you want. A knot like you see here:
If you are not planning on doing any high voltage measurements then I would suggest cutting off the standard tips and soldering some male crimp pins. You can insulate them with heat shrink to enhance their longevity.
It's been working great for me. Here is a picture of my setup and some crimp pins:
If you find it hard to buy male crimp pins then you can emulate this with a jumper cable or a pin from a breakaway header soldered permanently into a BLS housing.
Neither cheap nor simple, but I like the micro clips from the Hirschmann PMS 0,64 set best (clipped to a wire):
You can also plug the leads directly on header pins.
Why not push the test lead against one of the component's pins that you want to measure? If you push it down to the surface of the breadboard where the plastic has a little dent, your test lead will stick in that dent, just enough not to slip away. Of course you have to hold the test leads in your hand, you can't push them in all the way.
This post provides an interesting solution user paper clips:
Then you can solder it:
and use pliers to improve the contact.