Vaisala DM70 - Manual (Page 48)

USER'S GUIDE____________________________________________________________________
11. Wait until the readings are stabilized (can take one hour in very
low dewpoints). If the difference between the dewpoint readings
is less than 3 ºC, there is no immediate need for adjustment.
However, in applications where best possible accuracy is
essential, it is recommended to send the DMP248 transmitter to
Vaisala (see section Vaisala Service Centers on page 78) if the
difference is considered significant.
12. To return to the basic display, press Exit.
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