First off, it’s actually really difficult to test porosity at home. Many blogs and people on forums will tell you to conduct a float test, whereby you simply put a few strands of your hair in water and observe how your hair responds (if your hair floats, you have low porosity; if it sinks, high porosity). Sounds too easy to be true, and indeed it is. The float test can’t help you conclusively understand porosity because so many factors can skew the results. Some blogs also recommend watching how quickly your hair dries, but that is a. subjective, and b. can be impacted by factors such as humidity and your hair's density. Further, some claim that looking at your hair through a microscope can help to explain porosity. That solution, though, fails to give you the whole picture, offering no indication of hydrophobicity. Not to mention, most people don't have a professional grade microscope in their homes.
We’re not just listing the drawbacks of DIY porosity testing to sell our service. We've conducted countless at-home experiments over the course of the last two years, trying to achieve reliable results and understand porosity precisely. But we kept falling short. After exhaustive research, we're confident that the most accurate and the only surefire way to measure your hair's porosity one strand at a time is with a surface tensiometer.