Respirometers are specialised instruments used to measure the rate of respiration in biological samples, providing critical data for studies in physiology, biochemistry, and environmental science. These devices assess the exchange of gases, specifically oxygen consumption and carbon dioxide production, allowing researchers to evaluate metabolic rates in organisms ranging from microorganisms to plants and animals. Respirometers can be configured for both laboratory and field studies, with designs tailored to specific experimental needs. By accurately measuring respiratory activity, these instruments help scientists understand metabolic processes, ecological interactions, and the effects of environmental changes on living organisms. With applications in ecology, agriculture, and health sciences, respirometers are invaluable tools for research that requires precise measurement of respiratory rates and metabolic activity.