Very Many Fake DS18B20 Sensors

Chris Petrich Warns “Almost All” DS18B20 Sensors Not Bought From Authorized Distributors Are Fake
https://www.hackster.io/news/chris-petrich-warns-almost-all-ds18b20-sensors-not-bought-from-authorized-distributors-are-fake-afcc0a8befc5

A test purchase of 1,000 sensors from 70 different sellers showed the majority to be counterfeits of extremely variable performance.