Promax AE-166 User Manual page 92

To set the delta marker, press Return[F7] > Delta[F3] > X Axis[F1] and
set the x-axis position of the delta marker (frequency).
Press Y Axis[F2] to set the y-axis position of the delta marker
(amplitude).

The frequency and amplitude delta will be displayed on the remaining
function keys:
ΔFrequency[F3]: Position of the delta marker.
ΔAmplitude[F4]: Amplitude of the delta marker.
ΔTime[F4]: Time delta.
1/ΔTime[F5]: Frequency delta.
Example
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Figure 66. Spectrogram view is shown as an example.
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February 2017