Lambda Probes: Hardware with innate value

They are merely a few centimeters in size, but fulfill an essential task. They are sensors that measure the ratio of fuel and oxygen in the emissions of a combustion process. In the catalytic purification of combustion gases they measure the residual oxygen content of the emission after the catalyst.  

Their central component is a platinum coated electrode. Enough of a reason for us to buy, collect and diligently recycle even these smallest of precious metal hardware parts.