How should noise be compared when purchasing a meat grinder?

To compare grinder noise fairly, first check whether each supplier measured at the same distance, load and surroundings; otherwise the figures mean little. Request the sound-pressure test method plus separate no-load and loaded readings. Any sharp or unusual noise during a run points to bearings, the knife plate, gears or loose mounting that need inspection. In a shop, judge what the operator actually hears at ear level, not open-floor workshop data. Before a volume order, attach the passing sound level measured under continuous production, tie it to specific spare-part numbers, and verify the first unit against it.