We used to use an IDA for testing occlusion on the graseby syringe drivers but found they varied so much. You could calibrate it and then when testing again, it may vary by more than 50 mmHg. We questioned this with graseby (Brian Lane in tech support VERY helpful) and they told us about using the Alaris spring force test gauge. Brian sent us a copy of the test procedure and BINGO spot on every time.
Try this if you have it.
