3 Pack pH.1-14 Test Paper Extensive Test Paper Litmus Test Paper 240 Strips pH Test with Storage Case for Saliva Urine…

Amazon.com Price: $6.55 (as of 10/04/2023 04:12 PST- Details)

Paper Size: 45mm x 7mm (L x W), Comes with 3 Pack(240 pH Strips) and 1 Storage Case.
The test strip color changes must be matched with the pH scale color chart within about 15 seconds. Different pH content discoloration range is different, by comparing the color card ratio: the smaller the number, the stronger the acidity, the larger the value, the stronger the alkalinity.
Please do not dip the PH strips in the test liquid. It might lead to incorrectly showing test result. Please drop the test liquid on the PH strips. It will perfectly indicates the real acidic or alkalinity substance.