I get hundreds of calls for pH testing materials.  pH testing is very complex.  There are individual pH testing substances for everything, but they are very expensive.  This particular strip is reasonably priced and appears relatively accurate for saliva.  I am not as happy with the urine readings, but they are acceptable.  The range is from 4.5 to 9.0.  The exact unit increment ranges are 4.5, 5.0, 5.5, 6.0, 6.5, 6.75, 7.0, 7.25, 7.5, 8.0, 8.5, 9.0.  This gives you a more precise reading about saliva/urine pH.  Do not use these for water or other substances and expect a correct reading.  Use the Alkaline/Acid Water Test Kit for that.

I have looked a long time and through many companies to find these quality pH strips.  My experience with litmus paper strips has not been good.  I do not recommend them.

(pH Strips) 90 Strips/Bottle