0-14 pH Electrode Probe, pH Meter with Replacement BNC Connector and 300cm Cable Sensor for ph Monitor Controller Tester Meter Kit Set for Aquarium Hydroponics Plant Pool Spa

I RLY had my doubts buying this one, but it has proved itself. It measures accurate, works as it should. I'm impressed. Cant speak for longevity, but so far, it's still going. :)

I am currently using these for my Neptune Apex unit for a reef tank. They both were accurately calibrated out of the box when they arrived. As a precaution, I decided to do a 2 point calibration anyway. I have been using them for the past 6 weeks to give an honest review. I have purposely not done another calibration so I can document when they start to drift. I normally would want to calibrate every 2-3 weeks as a precaution. I am very pleased with how they have been performing. I would order with confidence again. In the screenshot I shared you can see the variance in the two probes. 0.05 is about the threshold I would say is time to do a calibration. They are starting to drift in my opinion. But they are still very accurate. Just not as precise. They are quick to respond to dosage chemicals which is important if you are controlling chemical pumps based on pH.

Cheap probe, does exactly as advertised. Use with atlas scientififc ph circuit. Its accurate within specifications but cheap construction, I dont anticipate this probe lasting longer than a year but for $17 you could by 3 and still be cheaper than most probes

This item replaced the pH probe on my deep water circulating hydroponic system. It was easy to swap out and calibrate. I was having trouble calibrating my old probe and I realized it had not been stored properly when not in use. If these probes dry out, they are ruined. Fortunately, this unit comes with a special bottle for storage which keeps the probe wet.

Pure junk. Don't waste your money. It never calibrated correctly and was .5 lower than the actual Ph when checking with 2 different test kits. That sucked but because this probe is so cheap I could live with adding .5 to the ph reading. Than it died in 2 months time. In my reef tank the readings went from 7.7ph to 2.2ph. Pure junk

Looks and functions just like the name brand except for the accuracy. Approximately a week after calibration(twice) it shows .3-.5 off of true ph reading

Great quality and accurate. This is my 3rd one. I use it for my reef tank.

Most importantly the probe arrived with the storage solution not dried up. When I buy the brand name Milwaukee probes half the time the storage solution is dried and the probe is unusable. This probe was not. It was well packaged to prevent storage solution loss. Calibrated it with the included calibrators and it works like a charm for almost half the price. What more could you ask for. Gonna buy another to have a spare on hand.