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In recent years the increased use of Biodiesel and Ethanol petrols has started to cause running issues with some diesel and petrol engines. Some vehicle manufacturers have specifically forbidden the use of such fuels on some of their engines because they can cause running problems on engines not designed specifically for them. The Laser Tools Fuel Identification Kit allows the user to quickly identify the presence of and percentage levels of biodiesel in diesel and ethanol in petrol by simply taking a 500ml sample of the fuel from the tank and placing the specially designed hydrometer in the fuel for analysis.