UIUZMAR Digital Dissolved Oxygen Meter Portable Dissolved Oxygen Test Kit with 3.6ft Electrode for Ponds Aquarium Aquaculture Do Meter for Water Fish Tank with Measuring Range 0.0‑40.0 Mg/L

Apropiado y cumple las espectativas

I give a four because u might get the instructions but if not that was the only part was I didn't get right and I can't really say how it worked. Sorry other than that quality of it was nice functional if u get it too work.

I have found it very difficult to calibrate and it has to be calibrated for use. I was going to return it, but I missed the return window by two days.

Either the probe or the zero DO solution was a problem bc the probe would not be calibrated correctly. I even watched a video to ensure I was doing it right.

I received this oxygen meter kit to help keep an eye on my backyard pond, and it’s been fantastic. It gives me quick, clear readings so I know the oxygen levels are safe for my fish and plants. It’s easy to use—just dip the probe in and the numbers pop right up on the screen. The meter is lightweight and portable, which makes it simple to carry around the pond. I really like that it comes with spare parts and solutions, so I don’t have to worry about running out when it needs maintenance. The readings have been consistent, and it gives me peace of mind knowing my pond is staying balanced. For anyone with koi, goldfish, or just a small outdoor pond, this kit makes water testing stress‑free. It’s reliable, easy to use, and helps keep everything healthy. Definitely worth it!

It works and I have had no issues for about a year now. If you know nothing about water quality equipment then this might be too complicated for you to calibrate. Get a chemical tester instead and do the drip method.

There are 2 different calibations that need to be performed before this item is ready to go. The first one is a Zero Calibration, and the kit comes with a one time use zero-oxygen solution, which is good for 2 hours after opening then should be discarded. This calibration should be done before first use. The second calibration is the slope calibration which needs to be done each time you use the meter. Also, you need to install a new membrane cap on first use, which should be rinsed with electrolyte solution, then filled with electrolyte solution. From reading the directions, it is my understanding that the membrane cap can be reused as long as the cap is undamaged and clean (and you can attempt to clean it with distilled water). As it comes with 6 extra membrane caps and 2 small bottles of electrolyte solution, I guess it could do at least 12 readings before you would need to refill your supplies. That of course is just a guess and use case might be different as I didn't use up all my supplies to get a solid number. I have a couple of small ponds with filters and bubblers, and was considering trying one with just plants and guppies. I wanted a way to test the oxygen when I started on that project, and this will do the job!

Once again, UIUZMAR delivers on a nicely designed, seemingly well-built water quality meter. In this case, it is a polarographic (membrane-type) dissolved oxygen (DO) meter that reports DO in mg/L (milligrams per liter) and % DO Sat (percent DO saturation). The built-in (and necessary) temperature sensor reports in both degrees Celsius (°C) and Fahrenheit (°F). The cable is only 1.1 m (3.6 feet) in length, so if your water surface is farther than this, you will need to bring the water to the probe on the meter with a water sampler, i.e., you are not going to be able to easily dangle this probe from a bridge to get a DO measurement. Unlike some other meters, the battery housing for this DO meter is protected with an O-ring. Like the other UIUZMAR I have, this DO meter comes with an excellent set of illustrated, printed instructions on the maintenance, calibration, and use of this DO meter. Moreover, UIUZMAR provides a very good, captioned video on the Amazon site demonstrating how to calibrate the DO meter. Regarding the instructions, my only recommendation is that the saturated air (slope) calibration be done in a partially (not tightly) closed container (e.g., Erlenmeyer flask) with some water in the bottom (photo). All-in-all, this is a very good DO meter. My main complaint is that they do not provide some sort of field case with foam for using this meter in the field. PROS • Clear, illustrated printed instruction booklet on the maintenance, calibration, and use of the DO meter augmented with a captioned video. • Battery housing is protected with an O-ring. • The probe cable connects to the meter with a quick-connect, not a threaded connector. • Probe shroud protects probe membrane and fits nicely in my 1,500-mL Erlenmeyer flask (with 400 mL of water in the bottom) that I use for saturated air calibration. • The 0-mg/L calibration standard is a liquid and not a powder that must be dissolved in distilled water. • Six membrane caps are provided. • Two bottles of electrolyte solution are provided. CONS • The DO meter is shipped in a box – no field case is provided. • The water saturated air calibration probably should be suspended over water in a partially (not tightly) closed container (e.g., an Erlenmeyer flask).

Easy to operate

Worked once but I could never get it to calibrate or take a reading again. It showed that sane number all the time. Took batteries out to try and get it working, recamibrated with solution. I so needed this for My eel tanks... thousands of lbs in them. I wanted to return but Amazon has the drop off for DHL or something as it camefrom USA. 1 hr drive away to nearest drop off point. I could not take 2 hours, as we fish 12 hrs a day and cannot leave the eel tanks. I was very disappointed Last august September. Right at the start of eel season. I never knew my tank oxygen levels, and didn't want to waste more money on a similar product.