This is the second time I have purchased this product. The product does what it is designed to do and is cheaper than most other pH storage solutions. I used to have cheap pH meters that had to be sealed in a bottle of about 1/2 inch storage solution because the caps that came with them allowed the solution to evaporate for 24 hours. A week often passes between applications. The new tester has a small clear plastic cap that screws on with an o-ring, so it will probably be a long time before I need more.
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