Diesel Test Kit:

• 100 ml durable glass bottle with a blue polypropylene cap.
• Inside the glass bottle is a suspended housing which contains a black pellet.
• Fill the glass container with unknown fuel up to the 80 ml mark.
• Screw on the cap.
• Observe whether the pellet floats or sinks. 
• If the pellet does not float to the surface, this indicates that the fuel does not comply with the EN 590 standards.