Review on 🧪 Macherey Nagel 90736 Analytical Strips for Efficient Determination by Mario Anderson

Didn't fit. The manual states in the fine print that this product will not operate at a relative humidity of less than 30%. I found that the product didn't really work when I tried to use it in an environment with relative humidity between 11% and 32%. There was no color change once I was sure the ozone level was well above 90 µg/m^3. The restriction for use at low relative humidity was not mentioned in the product description on the Revain website.