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I also bought to hear the sound of the bearing part I also have a bar-like scope but when you listen to the sound in combination with this type you can see the situation of the bearing well You do not have to bring your face close to the rotating part so danger It will be very low
I bought it to check if dust and foreign matter are mixed inside the pipe. It is a little disappointing result. It seems that a thin film is stuck with a bond, but it seems to be peeling off immediately, so it is necessary to handle it carefully.