1., intuitive: read the BOD value directly, without chemical titration
2. continuity: you can always understand the microbial degradation of organic matter in the sample process, draw the BOD change curve.
3. accumulation: concentration is too high, excessive period, the two results can be accumulated
4. samples, BOD value in the range of 0 to 1000mg/l, without dilution,
5. whole system seal, not affected by atmospheric pressure changes, accurate and reliable measurement