Fuel storage tanks may contain various types of contamination including rust, dirt, and sludge with Free water. If not removed before entering the fuel system, these contaminants can cause damage to high-precision components. Lab testing of fuel takes a lot of time and costs are high. To give you assurance on the quality of the fuel we recommend use of Tristar Onsite Testing kit. You can use diesel confidently without having to worry about damage to engine or pollution.