Can I bring industrial analysis equipments that I will bring back home again?

I am traveling for business and need to bring two suitcases of analysis equipment (non-medical). The idea is to go on site in various factories in China, take some sampleas and make the analysis with my equipment, and then bring the equipment back again. The total value of all of the instruments is approx. 100 000 RMB.

Is there anything I need to declare?

There ill also be very few selected, non-toxic/dangerous chemicals I need to bring for the analysis. I plan to bring Safety data sheets for all of them.
Do I need other documentatioin of the chemicals?
Do I need to declare the chemicals in customs?
(we are talking salt solution standards in very small amount)