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Draeger Carbon Dioxide Diffusion Tubes 500/a-DRange: 65 - 20,000 ppm x h500 - 20,000 ppm - 1 hour 250 - 10,000 ppm - 2 hour 125 - 5,000 ppm - 4 hour 65 - 2,500 ppm - 8 hour
**No Sample Pump is Required**