| Relative humidity |
Protect scope |
| 60%-55% |
Carbon paper, fax paper, uniques, pictures, money, stamps, printed paper etc |
| 45%-35% |
Metal without iron, semiconductors, circuit board, tungsten wire, IC card, batteries etc |
| 35%-25% |
Precise measures, optical apparatus, electricity, detector, lens, medical material, etc |
| 25%-15% |
Special chemical material, medical apparatus, sample, seeds, pollen etc |
