The ViP Ventilatortester is a mobile microprocessor which is used for controlled measurement for flow, volume, pressure and oxygen. It is made for medical and laboratory applications and specifically used to test ventilators. The prime advantages of it are its high measuring accuracy and ergonomic use. It can be used as a vast spectrum of use which enable this meter to stand as a perfect unit for surveying and testing functions. The measured values can be demonstrated, stored and printed by a PC programme (communication via RS232). The PC-software (freeware) allows simple operation through remote control and setting of the ViP or ViPex by PC or laptop. Pressure and flow can be showed graphically, saved and printed. The measuring for long period and storage of the measured data offer a fault analysis without too much of cost. Measuring units are flow unidirectional, tidal volume is minute volume, peak flow, time measurement (TI, TE, I:E, frequency) and differential pressure (high pressure-ambient pressure).