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A fluid container includes a vessel for holding a fluid, a marker element, and a scale element. The scale element has a scale for indicating a total quantity of the fluid. The marker element and the scale element are adjustable relative to each other to enable an adding up of amounts of fluid and th

A fluid container includes a vessel for holding a fluid, a marker element, and a scale element. The scale element has a scale for indicating a total quantity of the fluid. The marker element and the scale element are adjustable relative to each other to enable an adding up of amounts of fluid and thereby indicate the total quantity of the fluid. The marker element and the scale element are held together by magnetic force and may be detached from each other.

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What is claimed is: 1. A fluid container comprising: a vessel capable of holding a fluid, the vessel including a filling scale; a marker element; and a scale element including a total quantity scale corresponding to the filling scale, the total quantity scale including a total fluid quantity indica

What is claimed is: 1. A fluid container comprising: a vessel capable of holding a fluid, the vessel including a filling scale; a marker element; and a scale element including a total quantity scale corresponding to the filling scale, the total quantity scale including a total fluid quantity indication of a fluid quantity greater than a total volume of the vessel; wherein the marker element and the scale element are adjustable relative to each other so that the marker element indicates respective positions on the total quantity scale, the marker element and the scale element being detachably disposed relative to each other by a magnetic force. 2. The fluid container as recited in claim 1 wherein: the scale element includes a rotary element capable of rotating around the vessel; the marker element is disposed on the vessel; and the scale element is connected to the vessel by the magnetic force. 3. The fluid container as recited in claim 2 wherein at least one of the vessel and the rotary element includes a magnet. 4. The fluid container as recited in claim 2 wherein at least one of the vessel and the rotary element includes a magnetic material. 5. The fluid container as recited in claim 1 wherein: the marker element includes a rotary element capable of rotating around the vessel; the scale element is disposed on the vessel; and the market element is connected to the vessel by the magnetic force. 6. The fluid container as recited in claim 5 wherein at least one of the vessel and the rotary element includes a magnet. 7. The fluid container as recited in claim 5 wherein at least one of the vessel and the rotary element includes a magnetic material. 8. The fluid container as recited in claim 1 wherein: the scale element includes an elastic element capable of clamping onto the vessel; and the marker element is slidable along the scale element. 9. The fluid container as recited in claim 1 wherein: the total quantity scale includes a metal strip or sheet affixed to the vessel; and the marker element includes a magnet. 10. The fluid container as recited in claim 1 wherein: the scale element includes a magnet strip or sheet affixed to the vessel and having a scale thereon configured to indicate the total filling quantity; and the marker element includes at least one of a magnetic material and a magnet. 11. The fluid container as recited in claim 1 wherein: at least one of the scale element and the marker element includes a magnet; and the magnet is coated by a plastic material. 12. The fluid container as recited in claim 1 wherein at least one of the scale element and the marker element includes an iron backing disc. 13. The fluid container as recited in claim 12 wherein the iron backing disc is coated by a plastic material. 14. The fluid container as recited in claim 1 wherein that the scale element and the marker element include respective profiles adapted to each other. 15. The fluid container as recited in claim 1 wherein the scale element and the marker element are detachably connected with each other and each includes a respective mechanical connection. 16. The fluid container as recited in claim 1 wherein: the scale element includes a projection; and the marker element includes a groove configured to receive the projection in a snap-in fashion. 17. The fluid container as recited in claim 1 wherein: the marker element includes a projection; and the scale element includes a groove configured to receive the projection in a snap-in fashion. 18. The fluid container as recited in claim 1 wherein the scale element and the marker element are rotatably adjustable relative to each other in a step-by-step fashion. 19. A fluid container comprising: a vessel capable of holding a fluid; a marker element; and a scale element including a scale configured to indicate a total filling quantity of the fluid; wherein the marker element and the scale element are adjustable relative to each other so as to enable an adding up of amounts of fluid so as to indicate the total filling quantity of the fluid, the marker element and the scale element being detachably disposed relative to each other by a magnetic force; and wherein the scale element includes a magnet strip or sheet affixed to the vessel and having a scale thereon configured to indicate the total filling quantity; and the marker element includes at least one of a magnetic material and a magnet. 20. A method for indicating a total quantity of fluid, the method comprising: providing a vessel capable of holding a fluid; providing a scale element including a total quantity scale having a total fluid quantity indication of a fluid quantity greater than a total volume of the vessel; providing a marker element adjustable relative to the scale element and detachably disposed relative to the scale element by a magnetic force; adding a first quantity of the fluid to the vessel; adjusting the marker element relative to the scale element by an amount corresponding to the first quantity; removing the first quantity of the fluid from the vessel; adding a second quantity of the fluid to the vessel; and further adjusting the marker element relative to the scale element by an amount corresponding to the second quantity so as to indicate a total fluid quantity corresponding to the sum of the first and second quantities.