Breadboard polymer form and springs - note how the springs tightly insert into the board's polymer form. In the middle is a pile of springs, each will hold 5 wires in this breadboard version. At bottom is a disassembled power bus. This is one long conductive metal strip of springs.
The link shows how to measure the extra capacitance on the breadboard. Measuring resistance is more simple - just measure ohms from the two farthest holes.
Pop open a solderless breadboard to see what's under the hood. With some care, the top lifts up while a good number of springs remain stuck to the sticky backing. A wire cable is shown for comparison. Note some of the green faced sticky backing peeled away.
"When building an experiment on a solder-less breadboard, you add the small (stray) capacitor between adjacent rows of connection points to the circuit. This is because the way the solder-less breadboard is built, it has rows of metal connection strips laid side by side (0.1 inch apart) separated by plastic dividers. Because the strips are fairly long and they are in parallel, they have a significant capacitance between them."(1)
"Due to large stray capacitance (from 2-25 pF per contact point), high inductance of some connections and a relatively high and not very reproducible contact resistance, solderless breadboards are limited to operation at relatively low frequencies, usually less than 10 MHz, depending on the nature of the circuit. The relatively high contact resistance can already be a problem for some DC and very low frequency circuits. Solderless breadboards are further limited by their voltage and current ratings."(2)
|Showing two decoupling capacitors|