These test strips help you measure PH level in your fresh- or saltwater aquarium to help keep your fish safe and healthy. Help keep your fresh- or saltwater aquarium clean and safe with these Aquarium Test Strips. Comes with 80 strips and precise colour chart to help make reading your test strip simple, so you can easily locate and resolve imbalances in your aquarium water. For fresh- or saltwater aquariums To test, dip the strip directly into your aquarium Compare to the provided colour chart and come up with your PH level Item made in China. Has Chinese writing on. However, the chart and the way the strips works, require no knowledge of Chinese language :-)