... test paper and urine test strip for hospital,lab and scientific testing department.maybe we can do cooperation!Indicator ... test zones,within 10 to 60 seconds,read the corresponding pH.3 colors gastric aspirate pH indicator ... strips. 1 or 2 color saliva,urine,water,soil,rain,acidic and alkaline pH test ... strips to which several separate absorbent reagent test areas are affixed, the reagent strips ...