Comments: Seems to work great...I had the standard probe for a couple years and noticed that the pH was going wacky. We will see how long this works. So far so good.

Comments: The Neptune Systems PH probe is an excellent product. It came packed extremely well from Marine Depot. I calibrated the probe to the head unit with no issues and it started working flawlessly. I would highly recommend purchasing the lab grade probe.

Comments: Probe is working great right out of the packaging. I rinsed it, placed in the tankand connected it - pH reading within 10 seconds, didn't even need calibrated.

Comments: I bought 2 of these high grade because I knew they would last longer and be more reliable. Wrong. one of them already went out and nuked my SPS reef. it was solid registering 6.82 and after a couple of hours of troubleshooting I found the reactor to be down at 6.02..wow...very disappointing. luckily they took it back and sent me another in exchange. I will be second guessing from now whether i need the lab grade or maybe just by 4 of the lower grade so I'll have a couple extra around in a pinch. I rated this below average because of the price and you might not get what you pay for. Luckily it didnt kill any of my tank inhabitants.

Comments: It would have been a little nice if it included instructions. Is it calibrated? Any special precautions that I should take? pretty weak! Not too many options when it comes to probes, so not much I can do I guess.

Comments: Easy setup and it is great to have pH displayed all the time.

Comments: Seems ok I just wich it was made more clear that this DOES NOT include the calibration solution so when it arrived I was unable to use it

Comments: I don't have any comparisions, I purchased this one as a replacement for the first one-that I purchased 3 years ago-almost to the day.
<br />I use it in my freshwater tank to control my injected CO2.
<br />It has worked well and has been verified by my Ph tests.