... strips for semi-quantitative,visual determination of the pH in gastric tube aspirate of human origin for assessment placement.pH value ... 10 to 60 seconds,read the corresponding pH.3 colors gastric aspirate pH indicator strips. 1 or 2 color saliva,urine ... up to 12 analytes. For OEM and medical distributors. Best cost effective choice.ChinaYercon made,Glucose, Bilirubin, Ketone, Specific Gravity, Blood ...