Results for chlorine, nitrate, nitrite, general hardness (GH), alkalinity (KH) and pH Reactions stop at 60 seconds; other brands keep developing, which can cause higher readings.
With Tetra EasyStrips, It’s Now More Convenient to Test Your Water
More accurate hardness test
Reaction stops in 60 seconds to prevent false higher readings
Specification: Tetra EasyStrips 6-in-1 Aquarium Test Strips for Fresh/Salt Water
Amazon.com Price: $5.99 (as of 23/07/2021 05:45 PST- Details) Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.