D O Probe/Sensor,Dissolved Oxygen Probe/Sensor (Amperometric Gold/Silver Membrane Type) with STD. Salt Bottle's & Procedure. D.O. Accessories, Range : 0 – 20 ppm,Resolution : 0.1 ppm,Accuracy : ± 0.1 ppm,Temp. Comp. : 0 – 50 °C,Sensor : Gold/Silver Amperometric.D.O. Probe Designed in ABS Plastic to provide the rugged portability matched in fields with the accuracy demanded in the laboratory.The D.O. Probe/Sensor measures D.O. of any solution in the fields, laboratory or plant.