So, I will start by saying I love my trident. Now for the caveats and such.
The trident has served me well, however, I do not rely on it for any kind of automation or an accurate reading of the calcium, alk, and mag. I've found that it fairly regularly drifts from calibration and as such tends to read off. You may be asking, if it's inaccurate, why do you love it? Well, the answer is that it may not give 100% accurate numbers, BUT the relative numbers are generally accurate relative to other recent tests. The short version, it is fantastic for keeping tabs on rapid fluctuations which is what I'm actually concerned about and requires immediate attention. For exact numbers I use my Hanna checkers that I calibrate to lab samples and my every other month triton analysis.
TLDR: yes, but for monitoring purposes and not dosing automation.