Litmus paper for testing the pH of materials. This test is invaluable for testing solar hot water systems heat transfer medium to determine when it is time to replace.
The scale reads from 1 to 14:
1 – 3 indicates a very acidic substance
4 – 6 indicates an acidic substance
7 indicates neutral
8 – 11 indicates alkalinity
12 – 14 indicates a very high level of alkalinity
PH 1-14 color chart in each pack
The test strip color changes when applied to the medium under test. The color must then be matched with the pH scale color chart within about 15 seconds to ensure accuracy.
Paper Size:59mm x 8mm (L x W)
1.Simply press the testing strip to the object or liquid you are testing. Half second later, take out the paper and using the color chart included, compare the color change of the paper to find out the acidity level of your testing subject.
2.Can not indicate the Acid or alkali solution when its density was lower than 0.01%.
1Pcs 40pcs 1-14 PH test paper