Detection method of PH value:
Just use ph test paper for chemistry (which can be found everywhere in chemical shops and is very cheap) to detect body fluids.
The normal acid-base range of blood is 7.35-7.45, saliva is 6.8-7.5, urine is 6.5-7.8, tissue fluid is 7.0-7.5, cell fluid is 7.20-7.45, semen is 7.8-9.2, and cervix is 7.5-8.8. The acid-base level of body fluids is also related to the daily measurement time.
However, the blood pH value of patients with acidic constitution is 5.3-5.5, which belongs to real acidic constitution.