| Measured Gas | Hydrogen |
| Tube No. | 137U |
| Scaled Range | 0.05 to 0.8% |
| Testable Range | 0.05 to 0.8% |
| Unit Scale | % |
| Multi-Range | No |
| Original Color | Yellow |
| Stain Color | Blue/Yellowish Green |
| Shelf Life | 3 Years |
| CAS No. | 1333-74-0 |
| Tube Layout | [ Detector Tube ] |
| Typical Applications |
Industrial hygiene |
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