Customer Review

Reviewed in the United States on March 25, 2018
First one I bought broke but that was my fault, don't store these in deionized water. A good ph pen but I have some beefs with the company. I ordered another replacement for the one I broke. The one that arrived would not calibrate and I couldn't store it in solution for long term. I sent it back and got a replacement and realized there are two models for this pen. One with a o-ring by the bulb and another without. You can't store Hess wet without that o-ring seal. I'm attaching two pictures that show the differences. Should you get the one without a o-ring send it back and state you want he one with a o-ring. If you ask me this is some dirty pool by the company
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Product Details

4.6 out of 5 stars
4.6 out of 5
2,804 global ratings