Even if they were accurate, what good is this CYA reading? Is it 30 or is it 50? Or could it maybe be a little higher than that, say 60? Should you maintain a minimum of 2 FC or 5 FC? What if it looks closer to 100? Then you'd want to maintain about 8 FC minimum. Where is that? But is it 8 or could it be 6 or 7?AquaChek 7 Test Strips
Are these any good???