YINMIKWater PH Meter, 3 in 1 PH TDS Temp Pen Type Tester for Home Brewing, PPM Water Tester with Backlight for Water Purifier, Home Wine Beer Making, Pool, Hot Tub, Aquarium, Hydroponics, RO System

Working good

I can't tell much about accuracy, but other than that, I'm really happy. Makes life easier when messing around fish tanks.

The media could not be loaded.  I ordered this item and left a review that it never arrived it showed up very late but it did arrive. I tested this device and so far it works only thing I don't like is that the calibration jumps around before it zero out. I just decided to demonstrate what I meant and it did not zero out this time so this means I can not get an accurate reading.

Like being able to test the pH and TDS. It’s quick and easy with accurate results.

As someone who has used multiple pH pens in the past, including more expensive ones that performed excellently, I was disappointed with my recent purchase of a supposedly affordable pen. Right out of the box, I found that it did not measure the calibration solution accurately, and even after calibration, the readings were still off by a considerable amount, over 15%. To make matters worse, the pen would run slowly up or down, leaving me unsure of the accuracy of my readings. All in all, I regret buying this pH pen and would not recommend it to others. Don't make the same mistake I did - invest in a pH pen that you can rely on to provide accurate measurements and save yourself the frustration of dealing with an unreliable product. I am really starting to get disappointed with Amazon and the amount of junk products sold on this site. I am seeing why TEMU is better and bigger. Hopefully they don't sell junk too.

EDIT: After a couple months of nearly daily use (aquariums) the probe no longer holds calibration, and sometimes will not calibrate properly. Even with special solutions to calibrate and store.If you take care of probe properly it remains accurate, but if you simply put cap on and put away chances are next time you use the probe it'll be out of calibration. I work in a waste water treatment plant and calibrated probe with the same buffers we use at work and this probe was .1+- accurate compared to our expensive probe. I store the probe in a special ph storage solution, and that helps it hold calibration for much longer.

We converted our swimming pool to a saltwater pool. It’s easier on our skin , hair, eyes and clothes. I also need to add less chlorine to maintain the pool. Having a pH and a salt tester is convenient.This pH, Total Dissolved Solids, Temperature 3-in-1 tester came with more than adequate information booklets. Three “ag13” batteries were pre-installed in the pen type unit and the package also included 3 extra batteries. There are test probes at the bottom of the tester, protected by the extended body of the tester. This allows me to rest the bottom of the tester on the inside base of the container without damaging the probes. The pH tester has a glass or thin plastic thermometer bulb at the bottom also, so be careful using. Don’t bang it.This comes with 6 control packs of 250ml buffer powder to calibrate the pH meter. There are 2 packs for 4.00 pH, 2 packets for 7.00 pH, and 2 packs for calibrating 10.01 pH. I recommend mixing 1 of each packets in a sealable small GLASS bottle per the instructions, and keep the bottles away from direct light for future calibration of the pH meter. Each mix lasts a few months for necessary pH calibration if mixed with distilled water and kept airtight.The battery cap is on the top and screws off. It has an “O” ring that makes the battery compartment waterproof when the cover is properly screwed shut. Very easy access for changing batteries. This 3-in-1 PH TDS Temp Pen Type Tester is convenient and easy to use. Saves me time and money in servicing the pool. Despite the problems encountered by other reviewers, I find that compared to using the 5-drops pool water test kit and trying to average the pH based on the water color, this pen pH tester gets the job done adequately for a swimming pool. I have had this tester for 3 months and have not had to calibrate it again (yet). The readings are very close to the local pool store tests, and has stayed consistent.Maybe for very sensitive systems, a professional tester costing a few hundred dollars would be necessary for some users. This works adequately for my 9 feet deep pool.ALSO: I found that the numbers WILL wildly jump around if the probes are NOT immersed in a liquid. This should be expected. From High School Chemistry class, I learned that it would NOT be wise to use a metal or plastic container to test water in. Use an inert material like glass or ceramic otherwise free ions and impurities can give false readings.Hope this helps in understanding the science behind a unit like this. Clean the unit after each use, follow basic science rules and you should get good use out of this convenient pH tester as I have.

This YINMIK Water PH Meter model YK-3 is a 3 in 1 PH TDS Temp meter. I tested the TDS readings against some of my other TDS meters and they all measure within a few points of each other. So I am comfortable testing my RO water filter systems with this meter.I calibrated this meter without any issues when I first received it. I store these types of meters vertically so that the pH probe can be submerged in KCL storage solutions in their caps. The meter I received holds its calibrations fairly well for my home hydroponics systems.