I like these Salifert test kits. The results appear to be relatively accurate and they all work in the same way. I use them in the same order each time; Mag first, then Alk, then Calc to make the steps easy to remember. I think they are much more reliable than the cheaper tube test kits which require different steps for each test. These are just easier.
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review
𧲠Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review