During the inspection of a magnetic compass, which conditions must be satisfied?

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This item tests how a magnetic compass must be maintained so its readings stay reliable. A crucial part of that maintenance is the fluid inside the compass. The fluid must be clear so you can see any contamination or particles that could affect accuracy. The housing should be filled with that fluid and there must be no air bubbles; bubbles introduce pockets that can move with turns and climbs, distorting the compass reading or delaying its response. Colored fluid could hide impurities and make it harder to judge clarity, and an empty housing would leave no damping at all and destroy the instrument’s function. Therefore, the correct condition is a clear fluid with the housing full and free of bubbles.