11XB Alkaline Short Range 0 5-5.0 Indicator Lacmus Paper pH Test Strips High Accuracy Water Quality Aquarium Monitor CheckerOOTDTY  Features: 100% brand new and high qualityShort-Range: 0.5-5.0.Keep dry for the remaining paper.There are 5 sets, total 400 strips, metting all kinds of needs.Simply press the test strip onto the object or liquid to be tested. Take out the paper half a second later and compare the colour change of the paper using the included colour chart to find the acidity. level of your test object.Cannot display the acid or alkali solution if its density is below 0.01%.Specification: Material: PaperSize: 5x1cm/ 1.97x0.39 in（each strip）Package Includes: 400 Pcs pH Test Stripsnote: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item.