Excellent test to test repeatability, ensuring consistent results every time - annual calibration service and certification available. Auto-ranging, for increased ease of use. Easy to use, push button operation with no detachable parts or flip covers. US EPA approved DPD method, mean that results can be used for reporting purposes (subject to local regulations). High quality reagents, manufactured in accordance with ISO 9001:2000 standards, to ensure QC control and batch traceability. Advanced power management, including auto power-off and long lasting battery life. Lightweight design that is waterproof to IP67 standards and even floats if accidentally dropped in water.