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Summary:The ES 600 sample^selective multibatch analyser was subjected to a multicentre evaluation in six laboratories in accordance with ECCLS guide-lines. During the 3-month trial, five Enzymun-Test® diagnostics (T 4 , TBG, Digoxin, CEA and TSH)') were measured at 25 °C.The study yielded the following results:1. The within-series and between-series precision were very good, with mean CV's of approx. 3% and 7% respectively.2. Recovery of the target values for three control sera was in the range ±5%. 5. Within the measuring range defined by the standards, no deviations could be ascertained upon dilution of the samples.6. Total carry-over in the instrument was below 0.05%.From studies with instruments from the first production series, it became evident that modifications were necessary to improve the reliability. A follow-up measuring programme confirmed a clear improvement in reliability and a reduction in the imprecision, particularly for results from series to series.