I always wanted to know what that meant but no websites can really give me the answer. vip_hp has chosen the best answer to their question. View answer.
A respirometer is a device which is used to measure respiration, where organisms exchange carbon dioxide and oxygen as part of their metabolism.
Psychrometer An instrument used to measure the water vapor content of the air. It consists of two thermometers (dry bulb and wet bulb). After whirling the instrument, the dew point and relative humidity can be obtained with the aid of tables.