Review on 🧲 Advanced Precision Bubble Horizontal Magnetometer 521815Mm: Enhanced Research and Measurement Capabilities by Richard Alemayehu

Both are inaccurate on both sides, so both sides are accurate, chance of getting a usable value is 50/50. If you notice the sloppy side, that might be okay, but that's unwise for an instrument whose sole job is to measure level. Especially egregious for a tool labeled "High Accuracy".