We use an infusion tester made by Metron the QA-IDS or Lagu (UK agents Qados). Although I personally prefer the burette where you can actually see the result (a bit like anaesthetists with rotameters I suppose).
We use a burette and stopwatch. We have an IDA-4 but it's just not accurate enough for calibration purposes. We also use a dial gauge for syringe drivers.