Dissolved Oxygen Meter Accessories,Dissolved Oxygen Meter Calibration Solution Electrolyte Solution Membrane Cap Kit,1 * 50ml Zero-Oxygen Solution,2 * 30ml Electrolyte Solution,6 PCS of Membrane Cap

Funciona bien, solo hay que calibrarlo la primera vez y ya se puede usar sin problemas

I originally bought this water tester thinking I might use it for our pool, but I actually ended up using it to test some of my cosmetic formulations. I needed something that could check pH and a few other things, and this little gadget has come in really handy. It’s simple to use, doesn’t take up a lot of space, and gives pretty quick results, which is perfect when I’m working on batches and need to check as I go.The screen is clear and easy to read, even in lower lighting, and I liked that it was ready to use right out of the box. It seems to give consistent, accurate readings, and I really appreciate the temperature adjustment feature. It takes out the guesswork when the room isn’t perfectly controlled.The only reason I’m giving it 4 stars instead of 5 is because it doesn’t feel very durable. The buttons are a bit soft, and it’s definitely not something I’d want to drop. It’s splash-resistant, but not waterproof, so I make sure to handle it carefully, especially around liquids. You’ll also need to recalibrate it occasionally, and for that, you’ll need to grab the calibration solutions separately.All in all, it’s a great little tool for the price. If you’re working on skincare, haircare, or anything else where water quality and pH matter, this is a solid option, just treat it gently and it’ll serve you well.

Versatile and reliable tool designed for anyone who needs accurate water quality measurements. With its 6-in-1 functionality, it combines multiple testing capabilities—pH, PPM (TDS), EC, salinity, temperature, and ORP—into one compact device, making it an excellent choice for aquariums, hydroponics, pools, spas, brewing, and drinking water monitoring. The meter has a modern, handheld design that is lightweight and easy to use. The LCD screen is bright and clear, displaying multiple readings simultaneously for quick analysis. The body feels sturdy enough for both home and professional use, and the included ORP 222mV calibration solution is a thoughtful addition for maintaining accuracy over time. Accuracy is where this device truly shines. With its advanced sensors and simple calibration process, it provides highly reliable readings across all six parameters. The fast response time makes it especially useful for daily testing routines, whether you’re balancing pool chemicals, monitoring a hydroponic system, or ensuring safe aquarium conditions. This tester is designed with user convenience in mind. The one-button operation and straightforward calibration steps make it accessible even for beginners. Switching between measurement modes is seamless, and the waterproof probe ensures it can withstand repeated use in wet environments without issue. Few testers offer this level of versatility in a single device. It’s particularly useful for users who manage multiple water systems, such as hydroponics enthusiasts who also maintain aquariums or home brewers who need to monitor pH and TDS levels precisely. Its multifunctionality eliminates the need for multiple separate tools, saving both cost and storage space.

Didn’t work at all don’t waste money

Solid unit and simple to operate. No serious flaws. Comes with almost everything you will need to calibrate and use the meter. Note that to make-up the calibration solutions, you will need some plastic screw cap bottles for storage along with a semi-accurate way to measure out the required amount of distilled water. Obviously, you will also need distilled water, but I don't hold that against the device for simple packaging reasons.Very easy to read backlight display and simple push button operation. Will the accuracy match a precision laboratory meter ... I don't know, but it appears to give numbers accurate enough for simple day-to-day household use based on comparison with high-quality test strips. I prefer this type of unit over the tiny flat-pen style units but then again those can be found at a lower cost if you only need a single test or maybe just once or twice a year. I would have preferred to see a AA or AAA battery over the little coin cells but as long as self-discharge is under control when its "off", that shouldn't be a big issue. Both the battery compartment at the top and the probe cover have O-rings and appear to be well sealed to keep the battery area dry and the probe area wet. Do keep the probe moist / wet. Letting it dry out by losing or just not replacing the cap is not a great idea.If you do plan on a lot of semi-careful measurements, you might want to pick up additional calibration packets. The kit will get you started with one each of the 4, 7, and 10 pH buffers but these don't have an infinite shelf life after mixing. Even in well-sealed plastic bottles, these will probably become questionable after 30 - 60 days due to CO2 exposure from the air, evaporation, plus how often you open and close the containers. The dry packets are convenient because you have a fresh solution when you mix it and no question about age. The dry powder packets don't expire; you can put them in a drawer for 10 years then make fresh and accurate calibrants when you need. The pre-made liquid solutions have an initial shelf-life of a year or so but that drops to a month or so as soon as you open the bottle for the first time. It looks like the dry packets run about $7 or so for a set of 5 each 4, 7, 10 buffers. This should be expected for any pH meter, not just tis one.