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DO meters
===Dissolved Oxygen Meter===
Dissolved oxygen meters play a large role in brewery QC of the final packaged products as well as oxygenation of wort pre-fermentation. Although cheaper DO meters can be used to find the PPM(parts per million) of oxygen in the wort pre-fermentation, more expensive advanced equipment is needed post fermentation as you'll need equipment that is capable of reading much lower levels of DO.
===Orbital Shaker===