Review on 🔬 Comprehensive Salifert Alkalinity Calcium Magnesium Combo Test Kit: Accurate and Convenient Analysis for Your Aquarium Water by Katie Peterson

These are by far the best test kits. They are extremely accurate and all syringes are accurate. The only reason I give it 4 stars is because there is a step where you draw up the reagent and there is always an air bubble that changes size. The instructions say the air bubble is normal, but its size fluctuates, so it doesn't make sense. Some YouTubers say it must be a certain size, but it's difficult to control the size of the air bubble.