Measurement range of 0.0 to 19.9 mg/LQuick and accurate readingsWaterproof & rugged casing, ideal for field use in potentially harsh conditionsOne point calibration - can be calibrated in saturated air without the need for chemical solutionsBuilt-in ATC (Automatic Temperature Compensation) circuitry which adjusts all readings to ensure consistent, high measurement accuracyPrecise polarographic probe with a 4m cable for hard to reach places (included)Low battery indicator