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A resectoscope is a surgical instrument used to remove tissue from the uterus, prostate, bladder, or urethra. It is a type of endoscope, an instrument that combines a camera and instrumentation so doctors can view a surgical site and perform surgery through the same incision.
A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and/or carbon dioxide. They allow investigation into how factors such as age, or chemicals affect the rate of respiration.