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A respirometer is a device which is used to measure respiration, where organisms exchange carbon dioxide and oxygen as part of their metabolism.
A voltmeter is an instrument that is used to measure the voltage between two points in a circuit. The early voltmeters were based on moving coil galvanometers and were created by inserting a resistor in series with the instrument.It uses a small coil of fine wire suspended in a strong magnetic field.ultimeters can also be utilized in place of both ammeters and voltmeters. A multimeter is an instrument that can be used to measure both, currents as well as voltages. It can also perform as ohmmeters, a device used to measure resistance. Multimeters are available in analog or digital format. Ammeter.