The very cheap (< 1 dollar) NRF24L01+ seems to be counterfeit : http://hackaday.com/2015/02/23/nordic-nrf24l01-real-vs-fake/
They seem to be working the same, but I would like to see someone measuring them with a professional frequency analyzer.
When FTDI bricked the counterfeit chips, I had one of them.
I do have Arduino clones that have printed “Arduino” on them. They are counterfeit, but at least they have a real working ATmel chip, or could there be working ATmel chips now that are fake ?
Sparkfun reported fake ATmel chips : ATmega Slugs - News - SparkFun Electronics
I have a very cheap DS3231, that turns out to be not within the specifications. It could be a factory pre-run.
I also have those very cheap NRF24L01+, and the printed label on them look like the counterfeit ones.
So now I don’t trust any component I bought on Ebay. I have very cheap DS18B20 temperature sensors with labels that are not printed in the middle. I also have very cheap ACS712 current sensors. Are they the real thing or not ?
When I look in the mirror, is that … ?
What else is counterfeit ?