Hach Products Biochemical Oxygen Demand (BOD) Testing Click here to download the PDF Document for the following products. • APA 6000 High Range Hardness Analyzer • SP510 Hardness Analyzer (0.3 mg/L trip point) • SP510 Hardness Analyzer (2 mg/L trip point) • SP510 Hardness Analyzer (10 mg/L trip point) • SP510 Hardness Analyzer (50 mg/L trip point)