Features: brand new and high quality Aquarium Test Strips: It is important to test your aquarium weekly to verify good water quality with aquarium test strips, 6 in 1 strips with colourful comparison chart, suitable for both freshwater and saltwater fish for tank. 6 Material Testing: Aquarium test strips, combined 6 most critical water quality standard parameter, Hardness, Nitrate, Nitrite, Chlorine, Carbonate, pH. How To Use: Immerse the strip for 2 seconds and then remove the strip, do not shake excess water off, and then put the strip horizontally for 60 seconds, compare against the color chart and read immediately within 30 seconds to get accurate results. Multipe Usage: Can be used for testing various water quality, such as, all fish tanks, shrimp tanks, aquarium plants tanks, fish for ponds and many more. Package: Each bottle includes 100 pieces test strips. Specifications: Material: Paper Color: As Pictures Show Size: Bottle Size Approx.4.6x4.6x11cm/1.81x1.81x4.33in Weight: Approx.60g Package Includes: 1 Bottle of 100 Pieces Aquarium Test Strips note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!