Hanna Instruments HI-9142 pH Calibrator, 0 → +19.9 mg/L

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

Also available is a 460ml bottle of zero oxygen solution, required for regular calibration and re-setting of the meter

DO probe with 4m cable, 2 spare membranes, HI 7041S electrolyte solution, 4 x 1.5V AA batteries, rugged carrying case, instruction manual.