This hydrometer tests specific gravity from .700 to 1.000. Use this hydrometer to test the quality of your biodiesel.H Availability: Usually ships the next business day. Hydrometer 010Regular price: $25.95Sale price: $19.95 250 mL Graduated Cylinder Needed for Hydrometer, Durable plastic Availability: Usually ships the next business day. 250 mL Graduated Cylinder 015Regular price: $24.95Sale price: $19.95