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The 6500 smoke opacity meter provides a simple and accurate means of detecting and measuring the opacity of smoke emitted by diesel engines. This simple, portable and reliable meter has a variety of options making it suitable for any application. It is accurate to within 1% and capable of storing up to 100 tests. Designed to meet or exceed all the specifications required in SAE J1667, this easy to use meter is used by fleets, regulatory agencies and OEM laboratories around the world.