The Micro 5000 version Micro 6000 is a desktop computerised spirometer which provides accurate and repeatable spirometer measurements in Clinical Pharmacology and Clinical applications. The Micro 5000 version Micro 6000 is delivered with a Lilly Pneumotachograph designed on a Micro 5000 Standard Handle. Lilly Pneumotachograph is the reference flowmeter which ensures total linearity and reproducibility of measurement even at very low flow. The connection is pneumatic to the small amplifier and pressure transducer mounted in a USB connection package. This avoids artefact disturbance during measurements. The Micro 6000 desktop has elegant and small desktop mains powered interface which permits a heater circuit stabilised to 32 degrees to avoid clogging on the mesh from the condensation of exhaled breath. The unit also has a full weather station with barometric pressure, temperature and humidity to register ambient conditions and provide real-time BTPS correction to measurements.