First of all I have a really hard time liking anything because I'm a perfectionist and I'm expecting that everything will be fine. Finally great after buying various PH meters from $6 to $20 I've never been really happy because they all have a tiny little hole on the back for calibration or only on digital models a drop of water in the hole that measuring device is made as far as it always works properly. I use my gauge every day, at least twice a day, so usually for about a month I get other gauges that just need constant recalibration, or they just get worse, or water droplets get into that little hole. All I know is that I think this is the best pH meter for the price that literally feels solid. The lid has a rubber seal and if you put it in liquid for 3 seconds it gives you a base pH and up to 9 seconds you exactly what the pH is. There is a piece of absorbent cloth in the cockpit. So when you put the cap back on, water is absorbed on the tip and you have to put a few drops of the solution on that little foam cloth. which keeps your electric petal nice and clean. I would never write a long review of pH meters, but over the past few years I've been so disappointed in buying these cheap ones that I decided I'd at least save a lot of people a lot of trouble if they wanted to use their pH meters anymore than once. a year, like every day or every other day, this thing is reliable, and it automatically turns itself off within a minute to save battery, and they're interchangeable. It's also slightly water repellent so the buttons won't be damaged if a little water gets on them. Well I'm very meticulous and nothing is ever perfect but this is the best I've found in the price range so far.
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