- OX-1: Standard ppm sensor, 0 to 10, 20, 50 ppm, minimum measurement is 0.2 ppm
- OX-2: Acid gas resistant sensor for O2, 0 to 10, 20, 50, 100, 200, 500, 1000 ppm, minimum measurement is 0.2 ppm
- OX-3: Standard percent sensor, 0 to 1, 2, 5, 10, 25, 50%, minimum measurement is 0.01 (100ppm), accuracy reduced in the range above 50%
- OX-4: Acid gas resistant sensor for % O2, 0 to 1, 2, 5, 10, 25, 50%, minimum measurement is 0.01 (100ppm), accuracy reduced in the range above 50%
- OX-5: Standard ppm sensor, 0 to 100, 200, 500, 1000, 2000, 5000, 10000 ppm, lower cost version of the OX-1, minimum measurement is 5 ppm.