Great product for the money By David on 3/29/10

David would recommend this product to a friend

I got this as my back up. It works great, only off a little and that could be the other controller. I plan to verify with a more accurate test kit, used a red sea that is pretty old.
Affordable and Accurate By Stephen on 12/28/09

Stephen would recommend this product to a friend

I got this PH probe to use with my digital controller and it works perfectly. Was able to calibrate it in about 10 minutes and ever since has been perfectly accurate. I also verified the readings using a manual test and they matched up. It is very interesting and useful to monitor my daily PH swings.

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