What is the required compass precision when testing magnetic field strength?

• A. 0.5-degree increments
• B. 2-degree increments
• C. 1-degree increments
• D. 1-degree increments or finer

Answer: (D)

Precise angular resolution in compass readings is essential in magnetic field strength testing because small changes in direction can noticeably affect the measurement. If you rely on larger steps, you might miss subtle deviations, which leads to inaccurate results. Therefore you should use the smallest practical angular division available, or any method that provides even finer precision. This is why the correct option points to increments at the smallest practical angular division, or finer.