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Thanks for your responseMine has been fine. It's a little noisy but I can hear my reef dose and ato pumps too. Mechanical devices make noise when they operate so that doesn't bother me. Mine has been very accurate. I use the F1 for calcium and an X1 for alk. They both run on the same app. Set up wasn't to bad but not as easy as the reefdose. Mine has been very accurate. I prefer the reefdose just because I like the app better. It has more features and is just easier for me. That said if I needed a single head doser I would not hesitate to use an F1. I think I bought mine on Ali express for around $50.