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The test instrumentation used in the laboratory was assessed based on its manufacturers' statements of performance. This assessment was related to the specific test setups used for seven product safety tests to estimate the test instrumentation uncertainty for these tests. The estimated uncertainties for all five tests are shown. Three of these tests are discussed at length. The conclusions are that repeated tests of a test object are needed to prove that the measurement uncertainty for each test procedure is consistent with the measurement uncertainty of the instrumentation.