1. The glassware shall be handled with care and can’t be hit to prevent from being broken or injuring people.  

2. It is forbidden to use the incomplete glassware.  

3. Use desalted water to wash the sample both before and after using.  

4. Before taking the sample bottle for use, use the sample to wash it. And wash it with desalted water after using it.  

5. Put all instruments in the assigned positions after using.