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The Inductotrace (formerly Respitrace) inductive plethysmograph consists of two elastic bands with insulated wires (Inductobands) wrapped around the rib cage and abdomen and connected to an Oscillator module and Calibration Unit. It measures rib cage and abdomen compartmental volume excursions through changes in self-inductance of the Inductobands. The sum of these two excursions can be calibrated to a known volume with spirobag or spirometer. The sensors have insulated wire for self-induction monitoring with gold plated contacts and come in sizes to fit torsos from premature newborn to super obese subjects. For animal studies we have sizes from kittens to horses.