. The IDA doesn't even need to be calibrated to the n-th degree - it's the shape of the "waveform" that is of interest there. Rising sawtooth versus ragged zig-zag that fails to reach occlusion pressure levels, etc., etc.
Ah yes... seen that... In fact once when we were doing acceptance testing to a customer, all the pumps in the batch were giving me a good saw-tooth waveform... with the peak being around 230mmHg...
