I use this to ensure my pH sensor is accurate or as a quick pH reading after a tank change. It takes about 10 seconds for the pH to level off and lock into place. The readings themselves seem accurate as they are always within 0.1 pH of my sensor readings. I calibrate this monthly and the calibration process is as easy as it gets as it determines which solution is on its own in a matter of seconds. in my tank to see when it gets a specific reading.
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