Jellas Pocket Size pH Meter Digital Water Quality Tester for Household Drinking Water, Swimming Pools, Aquariums, Hydroponics, pH Measurement for 0-14.0 pH, ± 0.1 Accuracy, 0.1 Resolution.(Yellow)

I've had this PH Meter for a little over 2 weeks and it works great. I was using the API liquid test kits and could never find an exact match in color but new it was between 7.9 and 8.2. This meter confirmed it. Right out of the box it was .02 off from the 6.86 calibration solution which I thought was pretty good. I bought 7.01 and 10 Calibration liquid separate to test my meter to make sure that it is always dialed in as my tank should never be outside of those numbers. I plan on calibrating it every week as it only takes a minute and you really should calibrate these for better accuracy. I've read a few reviews saying that it jumps around a lot but in the instructions it says hold it in the liquid for a minute. It does change a lot within that minute but it will stable out for a good reading. I've even pulled it out cleaned it and retested numerous times and got the same reading. For the price this thing seems a much better solution for testing my tank for PH then color matching and guessing what color it really is. I would absolutely recommend this meter to anybody that is looking for a PH meter/tester. I will update this if anything changes with this meter but as of right now this is a must have for any saltwater/freshwater hobbyist.

Started brewing my own Kombucha a few months ago and this was a recommendation from other brewers. I love it as it is easy to use and takes the guess work out of the PH of your brew. Including pictures of meter and also meter in use. The shot glasses contain water at 7.8 PH and the next is Kombucha at 3.5 PH. Suoer easy to use and maintainJellas Pocket Size PH Meter / PH Tester / Mini Water Quality Tester for Household Drinking Water, Hydroponics, Aquariums, Swimming Pools, PH 0-14.0 Measuring Range, 0.1PH Resolution (Yellow)

I've been using this for a year on my fish tanks and it's pretty accurate according to the liquid kit I use to confirm the results. The 2-part liquid test kits are a pain, and the test strips aren't always accurate, so this saves a lot of time. The only drawback is no "hold" feature - as soon as you withdraw it from the water, it loses the reading. Reading it in-tank is difficult and would be easy to drop, so I use a cup. To calibrate I just use white vinegar, which is 2.2 ph.

I initially received a unit that did not work. Vendor contacted me and asked if I wanted a replacement. I declined worrying about the quality of such an economical meter. I was then issued a refund. Days later I received a delivery with a new meter (I had not requested it). Was suspect but tried it out and it worked perfectly. Was spot on with calibration out of the box. I should have just agreed to a replacement because I now have a great replacement meter that I feel guilty for not paying on. This is the kind of service recovery that all vendors should strive for. I just had a terrible experience with another seller and this restores my faith in the good guys that are out there. THANK YOU FOR A REALLY NICE INEXPENSIVE METER WITH GREAT SUPPORT!

Mine worked for a few weeks. It was then stored for about 1 month. After re-hydrating the bulb, it initially provided reasonable value, but then the display suddenly bounced to random numbers and settled on a reading of "1 (blank space) . (blank space). It is not a reliable device. Update, 3 July 2017 -- The company (Jellas) contacted me after reading my comments and promptly provided a replacement device (a pleasant surprise). The new pH meter is working fine. I have changed my rating from 2 to 5 stars for now. If a problem develops after non-use for a month or so, I will amend my comments.

This ph meter is handy, easy to use, inexpensive, and accurate. If you have fish tanks, using a pH meter is much easier and more accurate than using test drops or strips. The pH of my tap water varies and normally too high for my fish tanks. When I make weekly partial water changes on my tanks, I use this meter when adjusting the pH of water than I'm going to add to the tanks. By always adding water than is 7.0, I don't have to worry about the fish being shocked by large changes in pH. Being able to quickly and easily test the pH of a tank is a very handy as an indication problems with water quality. If the pH of a tanks shifts rapidly, it is an indication that something is wrong. Changes in pH also make it harder for fish to cope with other water problems such as Ammonia, Nitrites, or Nitrates. By checking the pH with this meter and the TDS with another, I can quickly check all of my tanks. If the values shift dramatically, then I know that I need to get out my test kit for test for all of the other stuff, and do a partial water change.Unless you pay 10 times as much or more for a laboratory quality meter, all of these affordable pocket-pen metes like this one will need adjustment for drifts in the reading over time. I bought a kit at the link below with test solutions of known pH, which makes it easy to know if the meter needs adjustment occasionally This meter is easy to adjust with a screw on the back.https://smile.amazon.com/gp/product/B0063MVU5S/ref=oh_aui_search_detailpage?ie=UTF8&psc=1About once a month, I simply dip it into a solution of known pH, and adjust the screw slowly if needed until the display shows the correct pH. Other meters that say they are "auto-calibrating" are anything but automatic. They require you to have test solutions of 2 different pH, normally 4 and 6.86. Finding test solutions of the required pH is often difficult or requires messy mixing of exact amounts of powers and distilled water. The auto-correcting ones then require complicated procedures of pressing and holding buttons while you dip the meter in test solutions and clean the meter between in distilled water between each test solution. It is time consuming, messy, and confusing.Simple meters like this one with an adjustment screw are much, much easier to test and adjust when needed. You simply dip it into a test solution of any known pH, and then adjust the screw if needed until the display shows the correct pH for that test solution. Adjusting one like this with a screw adjustment is no harder than moving the hands of a clock for day-light-savings time, while the "auto-calibrating" meters are more comparable to filing a long-form income tax return on paper without a calculator or PC.