When I started my HA system (around 2013) I bought quite a few first generation D/W sensors and added the venerable DS18B20... I bought them from respected distributors and never spent much thought about them. Fast forward to 2018-2019. I got interested in doing more experiments with temperature measurement and control so I started looking for "alternative sources". Price point of a Dallas/Maxim version is about 1.5 tot 2 EUR in small quantities and as the say "if it sounds to good to be true th