Milwaukee Instruments MA911B/2 Double Junction Ph Electrode with 2 m Cable and Gel Filled Electrolyte Solution

The probe is a great replacement for the bluelab's brand or for a general replacement, especially Milwaukee's probe is cheaper. Milwaukee's probe seems to be made a bit better too. I have bought a new probe from bluelab and it was defective thinking it was my monitor. They wouldn't even take a return on it. For the price and knowing Amazon will accept returns for something that could be defetive, I had to try this probe. The probe also comes with a sealed tube with storage solution. I calibrated the probe with no problem. As long you know how to calibrate the probe properly and have ph 7 and p4. You are good to go. It has been a week and my ph levels seems to be accurate still.

I tried a cheaper probe that was a waste of money. This probe works as expected. I will purchase it again.

Very accurate probe! I love the smooth finish and minimal design. This was a perfect replacement for the junk probes that Neptune gives with the apex. I am using this for a calcium reactor and so far very impressed for the money! I've used alot of probes over the years but this one stands out as superior. Typically cheaper is bad but in this case Milwaukee delivers a superior product at a damn good price!

The Neptune brand pH probe was sold out and a lot more expensive so I decided to give this one a shot for my aquarium. It fit on the Apex brain and is more accurate than the Neptune brand. It’s also lasted longer than my old pH probe and hasn’t needed recalibrated. Will never buy another brand again.

I calibrate this electrode every 2 weeks or so (2 times a month) and it's dead on -- but after a while.I've used Hanna's glass refillable ph electrodes ($$$ and breakable but worth it of you can afford it) and Bluelab's ph probe ($ and plastic like this one but it has a double ceramic junctions). The Hanna -- or any reliable glass, refillable, double ceramic junction, spherical -- ph electrode was best. Amazon doesn't carry these and the options Amazon does have to choose from are even more expensive probes from traditional (and expensive) companies like Thomas Scientific, Cole Parmer, etc.The bluelab ph electrode is usually my go to for cheap plastic probes like this but due to the reviews on amazon's handling of the bluelab probes -- letting them dry out -- I decided to try this product instead.I've tested this probe on a Bluelab combo meter and a Denver Instruments UP-10 ph/mV meter. Upon calibration on the Denver, it reported probe health to be 96% on first use.My biggest issue with this electrode is the response time. Bluelab's probe, you can move the probe around and mix it a little and in 20-30 seconds you should have a stable reading. This electrode, I have to leave in for minutes at a time!To get this down to reasonable times, I compensate by taking a very small sample size -- about as much volume as the amount of storage solution the cap should have -- and then I can expect it to stabilize in under <5 min.TL;DR: Decent combination electrode for the low price and fast shipping. Recommended for hobbyist usage but not recommended if you view or use your meters/electrodes as tools you rely on. Too slow for a lab or automated process controls, is only a single junction, and uses a cloth/fiber junction.

I had to replace an Atlas Scientific Consumer Grade pH probe that had readings drifting (even after multiple re-calibrations) after less than 1 year.... scanned Amazon and this item popped up. Based on other reviews I went for it. Looks relatively rugged ( for this type of instrument and cost. ) Reading "snapped" in SURPRISINGLY fast and stabilized very quickly (compared to other "cheap" probes I have) even on big pH swings. I have it connect to an Atlas Scientific EZO™ pH Circuit on an Electrically Isolated EZO™ Carrier Board via BNC->SMA adapter. I did a 3 point calibration and I'm back in action! Depending on how it performs over time I'm planning on picking up a spare for the shelf at this point. Will update if there are any major issues or setbacks.

Replaced the stock pH probe from my Hydros X10 controller with this. Easily calibrated and has been very accurate. Not impressed with the packaging from Amazon, paper envelope with a thin cardboard box inside that was crushed. The probe seems fine however.

I should have took warning to the comments I did see someone also received a used probe. I bought one and took it for granted I too received a used probe. It's also not described as pictured it shows the same model number but can be misleading. Anyway 2 stars for sending a used one. I am going through the replacement process if I get another used I will return to get my money back instead. 4-26-25 I'll update if I do end up in the same situation.