Much easier than portable testers. There's just no comparison. Even if a single test costs more, the tester you choose to use is better than the one you'd rather not waste time with. The results are almost instant. Also, it's a lot easier than trying to compare color charts that look different in different lighting. What a joy!
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Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
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