FROG @ease Test Strips for Hot Tubs for use only with FROG @ease In-Line and Floating Sanitizing Systems for Spas up to 600 gallons, Measures low levels of Chlorine, Quick and Easy Test Strips

So easy to use and seem pretty accurate.

We love these test strip for our spa. They are so easy to use and store in a convenient container. They were delivered on time as advertised.

I have using these for years for my hot tub and all I can say is I love these, makes it easy to test the hot tub water.

Very easy to read and a little cheaper than the spa store

Very quick and easy to use