spelling: epsilonMicros

Also, this value seems very small -- we don't need this much accuracy. The java time is rounded (up? down?) to the nearest milli, so that alone could account for 1000 micros difference. And then there is the roundtrip time for the transaction. I would be happy if the difference was within a tenth of a second, just to make sure it is not way off and to make sure that the test runs will not be unreliable.