The TR250Z oxygen sensor from this company is designed to lower maintenance costs by simplifying the calibration process. While most oxygen sensors are removed and manually calibrated, the TR250Z instrument can be calibrated in situ with the press of a button, using any gas with known oxygen level. The oxygen sensor can be used in any environment where oxygen depletion may occur, including vacuum test chambers, liquid nitrogen storage areas, enclosed spaces and other workplaces where pressurized gases can displace oxygen. — CO2meter.com, Ormond Beach, Fla.
Scott Jenkins