Sensing & Monitoring Polestar DSP-4000 Non-Destructive Optical Measurement of O2, CO2 and pH Polestar Tech are one of the world’s leading manufacturers of high-end measurement systems. The DSP4000 monitor can measure any combination of up to 4 parameters of: Oxygen (ppm or ppb) CO2 pH (6-9) Utilising optical measurement, the DSP is the safest and … Continue reading Sensing & Monitoring