Review on Digital Water Testing Kit - Ruolan Lab pH Meter, TDS and PPM Tester for Hydroponics and Water Analysis by Chad Gravely
Water meters are not waterproof
When I first used them, water got into them and they stopped working. This seemed very bad as these are water meters. They weren't underwater, they just had a test probe in the water. I've used many gauges over the years and have never come across anything quite like it. The return period is only one month, so by the time I discovered the problem it was already too late to return it. If you buy them, test them as soon as possible so that you can send back the defective ones.
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