There is a pure mechanical and ingenious way which is being used or processed in such a way where there is a camera which is hidden inside the nozzle which ultimately helps the mechanism to stop the fuel as soon as it touches the limit. It actually acts like a microprocessor. It is simply considered to be one of the important ones which is delivered in the way to make it perfect. There is a small hole in the tip of the nozzle which actually allows the camera to focus on it. This is simply helping no wastage of your money and fuel at the same time.
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