This a professional kit that is fun, easy-to-use, and inexpensive, so you can test for specific ozone levels in water. 

Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparators, Activator Solution, 25 mL sample cup, and instructions.

Analysis Time: 1 minute

Catalog No.: K-7404
Range: 0-0.60 ppm & 0.6-3.0 ppm (.025 kills E.coli bacteria in 5 seconds)
MDL: 0.025 ppm
Method: DPD
Each kit can perform 30 tests