This is mainly a rant. Part warning with a moral. I have been running my trident since it was first released. For the first few months I regularly compared it to my standard test kits because I didn't trust it. After a while of it being solid I stopped my own tests. About 2 weeks ago I put in new reagents and ran the calibration per usual. Tests all seemed normal with what they were previously. Over the past week my Ca has been regularly climbing to the point it's up to 674 on the trident. Just for fun I broke out the Hanna. 286. Ran it 4 times and each was 285, 286, 286, 287. Son of a bitch. I have a CaRX sitting in the sump not running because I dont really have much in the tank besides a few new sps frags so I was ok with the fact that my Ca would never really go down. I do water changes twice a week so I figured maybe I was adding more than I was consuming. Nope. Just a big fat lie. So the moral is do not trust a single source. Check it twice.