... !Indicator strips for semi-quantitative,visual determination of the pH in gastric tube aspirate of human origin for assessment ... effective choice.ChinaYercon made,Glucose, Bilirubin, Ketone, Specific Gravity, Blood, pH, Protein, Urobilinogen, Leukocytes,MA,Anti-VC & Nitrite.Reagent strips ... (sales on drug store or B2C) pH color chart pH test soil1.a. special pH,Double color pH strips 4.5, 5.0,5 ...