Review on Digital Water Testing Kit - Ruolan Lab pH Meter, TDS and PPM Tester for Hydroponics and Water Analysis by Angelica Obegi
Buy a better pen - Substance Analyzer
Bad POS I ever wasted money for 3 days and it is out of calibration. Within a week the batteries died, when I attempted to remove them, they corroded and rusted in place. Of course, they only give you 1 set of buffer solution, so now I'm waiting for an extra solution that I had to buy! Buy a better pen!
- Looks good
- Almost never
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