Features: Multifunctional test: This Aquariums test provide 16 common parameters, to help you test water quality. Water tester with precise color coordination and sensitivity, use professional for healthy drinking water test strips to test water quality . It includes 50/100 pool test strips and seal, ensure long storage. Soak a test for 2seconds , keep about 30'', then compare the color to the color from the back of this bottle, which take a few time. These test strips be suitable for drinking water, Aquariums, swimming and industrial water, pond, water testing. Specifications: Material: Paper Size: About.2.16x5.71inch Quantity: 50/100 Strips Package Includes: 50/100x Water Test Strips note: 1.Please allow 1-2cm errors due to manual measurement, note that you donot mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.