It has for me. I wondered on my DT because it never turned colors. But, all my other values were also saying 0. But, I got a second 1 for my quarantine tank and it “alarm green!” I mean.., clearly (not yellow) ... no wondering, GREEN! lolI’ve seen these but read mixed reviews .
do they work?
Will they alarm later in a established system ?
Double checked with my strips and api kit. I like the Salifert and Red Sea kits best. But, I have a reef tank and I know most stores don’t carry either. Plus, for someone starting out, it’s overkill. Anyway, I really like the little seachem badges. It’s easy and gives you a quick heads up (that somethings wrong.) And, it’s not tricky.., like guessing the shade of a liquid/API kind. I can say, I try to go by the directions and it says to change it every 6 months (whether it turns/alerts, or not.) So far, so good.