Industrial Test Systems 486634 Micro Ozone Strips, 0-11 ppm Detection Range (Bottle of 100)

I have a portable ozonator to clean my fruits and veggies from contaminants and pesticides. I use these to ensure it is working properly. Test is simple to use along with the photometer. Strips are good for over 18 months. Great value for 100 strips

PHOTOMETER REQUIRED! Don’t let the bad reviews deter you from a great product, they clearly did not read the description. No color chart matching! Fast shipping.

So there's really no way to tell what the strips mean because theres no key telling what shades of brown mean what. So the only real good they are for is to tell if ozone is present. Save your money, unless you have access to the legend telling what shades mean what.

Did not know you had to buy a test meter to use the strips. Thought they where test strips that when dipped in aqueous ozone would give the level of O3 in the water. Now I have four bottles of useless whatever they are unless I spend hundreds more. Great!!!

Do not order this. It supplies no color chart to match to results on strip. It says to follow instructions. No instructions come with product. Very poor, I will be returning it.