a monitor with a 1021 hPa message on it
A computer data screen has the numbers 1021 an 973 on it.
Screen that says that the current view is "QNH" and has a temp of 14 celcius.
A computer screen opened with SMARTViewer showing the current view.
A machine monitor with QNH 1021hPa RWY 28 is checking vitals or airplane variations.