Test-strips Super Sensitive (pH 4.5-9) are specially designed to measure the pH of saliva or urine, but it is also possible to measure the pH value of water. FDA and CE certified.
 
For urine, compare with the colour scale in the "scenario one" instruction manual.
For saliva, compare with the color scheme in the "scenario two" instruction manual.
For water compare with the color scale of the jar.