I'm a huge fan of my Alkatronic.
All I wanted a piece of equipment that reliably tests my alkalinity and reports the data to the Apex. The Alkatronic does this perfectly.
You can tell the machine is incredibly consistent. When I first got it I ran about 7-8 tests in a row and it measured all of them within 0.1 dkh. It has held it calibration perfectly for over a month now and continues to exactly match the output of my Hanna test kit (you are supposed to recalibrate more every 2 weeks but I'm pushing the envelope and thus far the machine is rock solid). The alkalinity is sent to my Apex via a BNC cable and that works great.
Cons:
- The software is not polished at the level of neptune's software, but it is perfectly workable. I almost never log into the machine, I just monitor the value through my apex, but if you were using their system it quite the best (but it's fine and improving all the time)
- It isn't obnoxiously loud when running, but it is louder than all my other equipment when it is running, which for me is 3 times per day for 10 minutes. Not a problem at all where my tank is, but if your tank is in the family room that might be annoying.
And one final thing concerning the reagent availability, I use my own. I wanted to be able to put the waste back into my aquarium and I was uncomfortable putting an unknown substance back in. I fully respect why they make the reagent a trade secret, but that just wasn't workable for me. So I learned about the titration method the Alkatronic uses and found a substitute reagent that I use for my machine. I don't know if it is the same or different than the official reagent, but all I know is my reagent works great. I'm not going to recommend anybody uses anything but the official products, nor am I going to say what I use, but I will say I use my own reagent and the machine works perfectly well. It is actually one of the reasons I like the machine so well is that it does a really simple process, so it is always going to produce very reliable results and it is very easy to debug when something goes wrong.