Flow rates are measured volumetrically and are independent of the liquid type up to a viscosity of 10 centipoise. The unit uses asingle chip micro-controller, the flow-rate (rounded to four digits) is displayed on a large four digit back-lit Liquid Crystal display(LCD) and data is output via the built-in RS232 interface to the full 6-digit reading. No user calibration is required; the unit isnormally supplied gravimetrically calibrated at 1.0 (+-10%) ml/min. Calibration at multiple points is available. All wetted partsare made of PTFE , PEEK , DAI-EL PERFLOUR or Pyrex glass – no wetted metallic parts.