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o = Ohm (Pt100)
H = Hertz (flow m/s)
u = Micro volt (thermocouples)
U = Volt (humidity)
1.8.2 Zero adjustment
A long press on the F1 button (approx. 3 s) enables you
to set the displayed value on 0. Before pressing the
button make sure that the actual value also amounts to
0 (no current/pressure at the probe).
1.8.3 Deactivation of the 2nd channel (toggle)
A long press on the HOLD button (approx. 3 s) enables
you to activate or deactivate the 2nd measuring
channel.