Well I've been using it for several months and so far there are no problems. Calibration was a little tricky, I just had to keep trying until I got it calibrated the way I was supposed to. I use it about every other day and check the calibration about every few weeks and so far I haven't had to recalibrate. It is very important to rinse the probe with some distilled water after use, then I shake off the water and inflate to dry before putting the cap back on. It seems accurate enough for my needs, when I test it to see if it's calibrated it's within a few tenths and stays that way. Very easy to use, I would like the display backlight to stay on longer, but turning it off and then back on fixes this problem. The TDS meter also seems to work very well. I have tested it with reverse osmosis water from a 6 stage filter system and so far it is working as it should. 5 stars recommend to anyone who needs a ph/tds meter.
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