What is the accuracy of the NucleoCounter?

As a universal standard for cell counting does not exist the accuracy of the NucleoCounter is difficult to assess. On the other hand, one inherent property of the NucleoCounter is that all instruments respond in identical manner to detected signals. As a result of this no significant difference between two NucleoCounter instruments can be detected. So whatever the "accuracy" of the NucleoCounter is, the reproducibility of the NucleoCounter is only determined by the repeatability of the instruments. If a universal standard existed, then the accuracy in the example used in the FAQ concerning the standard deviation of the NucleoCounter, is set by the Coefficient of Variation (CV) or in that case 2.7% expresssed as one standard deviation.