Test package provides immediate, unambiguous indicators of fuel quality without the need for technical expertise. Simple test is ideal for anyone who uses biodiesel fuel in their commercial or personal vehicles, giving immediate feedback on whether a fuel meets basic criteria for use. U.S.A Compatible With: Bio-diesel, Water and Visual Clarity Test: Yes, Acid Number Test: Yes, Total Glycerin Test: Yes, Percent Biodiesel Test: Yes, Biodiesel Style: B20, Test Qty.: 4 Fuel diagnostic tests allow you to instantly verify key quality indicators of B20 (20% biodiesel) fuel