Hans Rudolph, makers of three unique types of lung simulators with one specifically applying to the pulmonary function testing labs that the various pharmaceutical manufacturers contract for drug studies and the quality control and testing of the respiratory devices that measure the diffusion lung capacity of patients. This device is the 5560 series DLco Simulator with EasyLab QC Software.

A series 1120 flow / volume simulator intended for testing and calibrating peak flow meters and spirometers, and doing research requiring the ATS and custom waveforms.

A spontaneously breathing lung model named the series 1101 Breathing Simulator is for testing, training, and calibration of ventilators and other respiratory therapy devices.