METREL MD 9070 Manuel D'utilisation page 18

MD 9070 Insulation/Continuity Digital Multimeter Operation
Smooth mode (Insulation Resistance function only)
Smooth mode displays the running average of the last eight measured readings
having changes within 300 counts in sequence. On the contrary, it displays
directly ,without smoothing, the measured reading that is beyond 300 counts in changes
comparing to its former one. Press the button momentarily to enable with LCD
annuciator " " turned on. Press momentarily again to disable.
18