Test kit 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, Percent Biodiesel Test: Yes, Biodiesel Style: B20, Test Qty.: 12 Detects biodiesel blends greater than 30% biodiesel Identifies fuel that may cause filter plugging due to biodiesel solvent properties or fuel that may be out of warranty requirements