Review on Aideepen TEC1-12706 12V 6A 60W: 5pcs Heatsink Thermoelectric Cooler Plate Module 40x40MM - Efficient Cooling Solution by Patrick Brinson

I have ordered 2 sets of 5 from this supplier for a project my daughter is working on. We've observed temperature spread with every cooler and heatsink we've tried. I ended up running all 10 through an Arduino program I wrote to test 6 parameters. 5 devices had shorter leads tinned to the modules. Everything was perfect there. The other 5 had long pure copper wires and were all over the world in terms of performance. The bottom line is to send the copper back when you get it.