Our water comes from a natural spring. I bought it to regularly monitor my tap water to make sure it's safe to drink. I read a meager sheet of instructions before attempting to use it for my first test. It would be helpful if there was a video on the internet showing how this is used. Once I got the ppm reading I pressed the button to switch modes but it didn't switch. It would simply reset and read ppm again. After several attempts I tried to turn it off according to the instructions but it didn't turn off. Even if I kept it, the non-removable battery would die and it would be unusable. I came back to this after giving it 3-4 hours to sort itself and tested it with Poland Springs water. No reading at all. Did. I am very disappointed as this would fill an important need if it worked. It's up to you to decide, but I still don't recommend it. Hope you have better luck than me. All the best!
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