Polestar Technologies Advanced optical technology for dissolved oxygen and pH measurements. Robust Sensors - no electrolyte, no membranes, no fragile parts. DSP3000 utlilizes state of the art digital electronics. Automatic, 1-point, and 2-point calibration Available in a variety of sensor configurations. DSP3000 is panel, pipe, or wall mountable. Also convenient for benchtop applications. Optical Oxygen, pH, CO2 Sanitary cap sensor Peel and Stick sensor dots Insertion Probe