Be sure any lids or bottle caps are loose. Do not heat any liquid in a tightly sealed container, it can cause an explosion. Always keep all gas or vacumn tubing away from the hot plate. Rinse the pH probe with DI water before and after use. Be careful of calibrating the probe.
Centrifuges Check that the chamber is clean and dry before use.
If not have last person clean it up, or do it yourself. Check rotor for spills before and after using. Spills must be cleaned ASAP or they can damage the rotor. The red needle is the idle temperature and is usually set to 10 degrees. Don't place the two needles closer than 6 degrees or the temperature may fall below the blue set point and freeze your sample.