Despite the many stripes in the kit, I can never do just one test. In 25% of the cases, the color change behaves strangely. Sometimes there are spots of different colors on the pads. Yes, I follow the instructions. The pH test is the most unreliable of all, typically reading 6.5-7. A reliable API water test kit (pipette version, not strips) will always show a pH of 7.8-8. I would trust the test. Nitrite and nitrate for a rough estimate, but kh and gh seem pretty weird too as the results vary from band to band.
FUNSWTM 7 in 1 Aquarium Test Strips: Accurate Water Testing for pH, Nitrite, Nitrate, Chlorine, GH & KH Levels
8 Review
Fish Water Quality API Test Kit
9 Review
π¦ Comprehensive Water Quality Analysis: ICP 33-Elemental Test Kit - Single Sample Kit
9 Review
Highly Efficient Seachem Purigen for Freshwater & Saltwater Filtration
9 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review