Digital PH Meter for Water, 0.01 PH High Accuracy Pen Type PH Tester for Household Drinking Water, Aquariums, Swimming Pools, PH Range 0-14

This device proved to be a helpful tool in achieving the desired pH level for my plants. I was impressed with its sturdy construction, and I even tried storing it in a DIY solution for 24 hours, which worked well. However, I must caution any beginners out there: do not test the product for water resiliency, and do not drop it in water. Only the first 1-1.5 inches of the pen should ever be submerged in a solution, as indicated in the instructions that come with the product. To prevent contamination, do not test directly in your solution. Instead, pour a small amount of solution into a glass to test. When storing the pen, I recommend storing it in electrode solution right after opening it. If you're not sure how to make the solution, you can purchase a bottle of it on Amazon. Or, if you're feeling resourceful, you can make your own storage solution using 1lb of KCL, an AMIR portable scale, some graduated pipettes, and de-ionized water from the grocery store. I tested distilled versus reverse osmosis water and found that the latter was closer to 7.0, so I used it for my solution. I then mixed 7.45g KCL in 100mL of the neutral water to create a 4M KCL solution, which is all you need for a lifetime supply of storage solution. To use the pen, simply rinse it with neutral water, place it in a small glass with 1 inch of solution to test, record the value, rinse it off with neutral water again, and put it back into the storage solution. Overall, I gave the product four stars for a few reasons. Firstly, it is "very accurate," meaning it helps me get closer to the desired pH level with an accuracy range of 0.1 to 0.5 pH. However, I don't trust the factory calibration and have already noticed some variance. Secondly, it is "cheap," and I couldn't find anything cheaper on the market. Finally, I have compared this pen to other analog chemical reagent tests, and it beats the general purpose hot tub kit and General Hydroponics reagent kit by a considerable margin.

If you own a pool or hot tub, you may be familiar with the difficulty of reading PH strips, which can cause problems due to the indiscernible colors. To ensure my PH stays within the correct range, I purchased a tool that eliminates the guesswork of testing PH levels. Upon receiving it, I calibrated the tool and found it was already calibrated correctly. However, after a few weeks, the calibration had increased slightly, so I recalibrated it by dipping it into the provided solution and resetting it to the correct reading. As saltwater tubs tend to naturally raise PH levels over time, I check my hot tub PH in the morning and evening using this easy-to-use tool.

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.

To ensure longevity, avoid leaving it in R/O or distilled water for an extended period, as this can damage the device functionality. When storing the device, rinse it with R/O water and use a soft cloth to dry it. Adding a drop or two of tap water (not R/O water) to the cap can help prevent it from drying out, and always remember to replace the cap when storing it. I have compared this device to expensive pens and found and ot work just as good , maybe better, very accurate readings. It doesn't require storage solution. the calibration packets are cheaper than those of other, more expensive testers. However.. the calibration packets are not in liquid form, and must be mixed and dissolved completely before use. To ensure accuracy, test your tap and R/O water periodically.