Vaisala PTB220 - Manual (Page 30)

U SER ' S G UIDE _______________________________________________________________________
24 ___________________________________________________________________ M210194 EN -A
The PTB220 series barometers will show * instead of numeric values
for pressure trend and pressure tendency for three hours from power-
up.
In case of error in the barometer, the relevant error message will
automatically appear on the second line of the display. In this case,
any other information defined using the DFORM command will be
replaced with an error message.
By pressing the arrow button on the left, you get a display having a
horizontal bar display on the upper row. On the lower row there are
three values: the value on the left shows the lower limit of the pressure
range, the middle value shows the actual pressure and the value on the
right shows the upper limit of the pressure range.