You're deeply confused about CE (also in <a href="https://news.ycombinator.com/item?id=40848745">https://news.ycombinator.com/item?id=40848745</a>).<p>CE is not a certification or a test, it's a self declaration.<p>You declare to be compliant with all relevant European regulations by marking your product CE. You could even mark your product CE without doing any tests, if you're very confident.<p>You also decide what tests you need to run, which of them to run in-house, and which of them to outsource.<p>You decide whether or not to trust components' CE marks. Or maybe retest them. It's your decision, you're liable for everything in your product.<p>Now, why are Chinese companies so cheap? Maybe they are very cost-efficient. Maybe they don't really test at all and just send you a fake report. Maybe they test only a small sliver of relevant things. Who knows?<p>The thing is: unless you know what you need to feel good about your product, price-shopping is senseless.