Ph Meter, Dr.meter PH100 0.01 Resolution High Accuracy Pockey Size Ph Meter with Atc, 0-14pH Measurement Range Water Quality Tester for Household Drinking, Pool, Juice, Laboratory and Brewing

This has been the best PH meter I have used yet. Over the years I have tested a number of different meters:5/5 Dr.Meter ~ Very accurate, holds calibration, easy to calibrate, temperature compensated, waterproof, works like a charm!!4.5/5 Oakton EcoTesr ~ comes in second not quite as accurate as the Dr.Meter3/5 Hanna Instruments HI98103 ~ convenient calibration with screw, not waterproof, doesn't temp compensate so not as accurate.2/5 HealthyWiser Digital pH Meter ~ cheap, but inconsistent reading, not temp compensated, big pain to calibrate1/5 Hanna Combo pH/EC/TDS/C/PPM Tester HI98129 ~ not happy with my experience with this, loses calibration quickly, stopped working.Seller (Hisgadget) gets top score for customer service, they went above and beyond to help me when I broke the tip (tips break easily on most pens, i broke the Oakton int the same way)

I have a lot (and I mean a LOT) of experience testing water. Between years of pool ownership and decades of owning fresh and saltwater aquariums, I've done on the order of hundreds of thousands of water tests on more parameters than I care to list here. I've used strips, titration tests, probes, meters...you name it, I've done it.I received this meter and read through the instructions very quickly. I don't know why someone said the manual is not easy to read but...Look at the grammar in that review and I think all of your questions on that will be laid to rest. It was very simple to read, and follow and I was able to finish the calibration within minutes. Please make sure you use the recommended amount of water because when it comes to testing things like pH, you're testing on a logarithmic scale...meaning each whole-number change in value is 10 times more or less acidic...i.e. pH of 8 is 10 times more basic than pH of 7 and 9 is 100 times more than 7, etc...Sooooo...if your calibration is off because you skimped on the water, your readings will be off.Once the calibration was finished, I set to testing the water in my marine aquarium, verified by another electronic meter AND a titration test. This meter proved to be highly accurate in both pH and temperature (which is important because temp effects pH). Be patient with it, though...don't just did it, look at the number and call it a day...you need to leave the meter in the water until the numbers stop changing for several seconds...kind of like making microwave popcorn...you know when it's done because the pops get infrequent. This is the same way you use a meter. And it is a lot faster than strips or titration.I would certainly recommend this for anyone who needs pH testing done on any water source.

Tried many pH reading mediums including strips, liquid solution and the throw-away pens. The liquid solutions came close but are not completely accurate. With proper calibration (takes some effort to read and thoroughly understand the instructions and process), this little meter gives by far the most accurate pH reads. As a bonus, the meter reads the water temperature. For the price, this little model is a steal and calculates close to the $150+ models. Personally, I use to calibrate pH and temps for water changes in my aquariums. Prior to purchasing this meter, I was guesstimating or running many liquid tests to match the new water to the existing tank water being removed. This little meter pays for itself quickly in time and solution costs. I simply add buffering and hot water to the tap water and test as I'm adding. Get an exact match each and every time. My fish are happier and less stressed for the extra effort and patience required while the meter reads stabilize.For those who gave the meter less than 3 stars, I would venture to guess their initial calibration was improper and/or they lack the patience for the reads to stabilize.NOTES on this model:Calibration MUST be followed exactly as the instructions state. There is indeed a 9.1 solution rather than a 10.0 but the meter will calibrate exactly.The pH reads do take a minute or more to reach stability thus patience is required. Swirling around will help the unit to read quicker.The tip MUST be kept moist at all times to avoid having to recalibrate. I simply washed the sponge that came with the unit, keep it wet and over the sensors then place the cap on tightly. Presto, stays calibrated and gives accurate reads each and every time.