I thought I could check the effectiveness of my entire water softener and charcoal filtration system. No, the same readings no matter where I test in the house. Internet research confirms that this gives no idea how well standard filter devices work, so I have no idea what the Britta and PUR ads are trying to tell us. Maybe it will be useful in aquariums, I don't know. For me, it just lets me compare the TDS at my house to my friends' TDS, which I don't really care about. I think if you are looking for a tool that will tell you that a reverse osmosis system can make a difference then this is it. However, I'm sure we can all say that a reverse osmosis system lowers the TDS regardless of the starting point. So if you're unhappy with your tap water, buy a reverse osmosis filter and save on a TDS meter.
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