The portable energy expenditure meter is designed for  quantity estimation and qualification of heaviness of  physical work on working positions in factories. It could be generally used by qualified employees of technical services or  services of security and sanitation of work. 

The operation of energy expenditure meter it based on measurement of airflow caused by inhalation done by controlled person and on the ascertained correlation between the size of ventilation and oxygen absorption, and, as a result,  the energy expenditure.