ECOTEST DoseG Operating Manual page 22

1.2.2 The dosimeter displays "nnnn" char-
acters when it measures DER as a sign of DER
exceeding the upper limit of the range when it
is irradiated with DER from 12.0 Sv/hour to
20.0 Sv/hour.
1.2.3 The dosimeter records the events of
DER exceeding the upper limit of the meas-
urement range and displays the occurrence of
such events by flashing DER value in its dis-
play mode.
20