I tested a couple of these solderless breadboards for resistance. I tested some of the power rails and some of the 5 hole connectors and found almost 0 ohms resistance. Approx. .1 ohm on the rails. That's really good. I bought some boards elsewhere and had to throw them away due to very high resistance. For the money, these are great. The spring retention is also very good. I had no trouble using either the 22awg or the 20awg wires with nice tight fit.
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