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There are many reviews of these devices on YouTube, but most of them are long and from electronics engineers who need special types of signals and frequencies for which these devices are not designed (in their opinion). Often, a car diagnostician needs an oscilloscope to check for the presence of a signal, check its voltage and duration in a certain range, which these devices can handle quite well. And there are practically no videos of their use in car diagnostics. I recorded signals from crankshaft and camshaft sensors with Fnirsi oscilloscopes and I want to share this with you.