<P> As changes in temperature or pressure can also affect the displacement of the manometric fluid, a second respirometer identical to the first except with a dead specimen (or something with the same mass as the specimen in place of the organism) is sometimes set up . Subtracting the displacement of the second respirometer from the first allows for control of these factors . </P> <P> The set up of modern respirometers is described in more detail under respirometry . A Respirometer may also be called an oxygraph . Suppliers for whole animal respirometers are e.g. Sable Systems, Qubit Systems, Eco-environment Technology, or Challenge Technology; for mitochondrial respirometers Oroboros Instruments, Hansatech Instruments, or YSI . </P>

How is a respirometer used to measure fermentation in this experiment