This instructable will go through how to make a standard 1/4W carbon film resistor into a cheap probe adapter for use with breadboards.
Step 1: Gather parts.
A generic 1/4W carbon film resistor (the most common type. If you are unsure of your resistor type, its probably this)
Some needlenose pliers.
Step 2: Start Crushing
Try to get as much as you can, because the less you have left, the easier step 3 will be.
Step 3: Pull
Step 4: Use
If you wanted to, you could use this for testing more finished circuits as well. The leads are straight off of a resistor, so they can easily be soldered into a circuit to create a test point, for probing into tight spots that you frequently need to access.