I have several pH meters for different aquariums. I got the Milwakee 2 years ago and it still works great and accurate, only 1 or 2 calibrations in 2 years. When I received another Milwakee gauge, it was inaccurate even when calibrated. I sent it back, got a replacement and I couldn't calibrate it. je. I sent him back. I ordered another one to make sure I only got 2 faulty units or bad sensors and the last one I got works fine and accurate. In doing so, I got a different brand PH monitor for half the price that uses batteries. DC and not only measures accurate pH but also very accurate temperature and it has a backlight. So my Milwakee message is make sure your quality doesn't degrade and add a backlight to your gauges and temp readings because you have a new (I believe this is a new) competitor with the best product at half the price ! I don't know how long these new counters from Milwakee or any other brand will last but trust me if either one breaks I will update this review.
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