It depends on your topic of the research. If you are trying to do comparative research, you may contact researchers for permission to use existing instruments. However, you have to be careful on cultural issues and the way statements are asked.

There is no consistency in CSR measure use in prior research, and the choice of a scale depends on your research aims. There have been quite a few good measures developed recently, I would suggest looking at. For instance, Öberseder M., Schlegelmilch B.B. and Murphy P.E. (2013), "CSR practices and consumer perceptions", Journal of Business Research, Vol. 66, No. 10, pp. 1839-1851 (CSR measure of consumer perceptions), or El Akremi A., Gond J.-P., Swaen V., et al. (2015), "How do employees perceive corporate responsibility? Development and validation of a multidimensional corporate stakeholder responsibility scale", Journal of Management, pp. 0149206315569311. (employee perceptions).

 Hi, you can also look into:

https://www.researchgate.net/publication/313160723_Corporate_Social_Responsibility_Impact_on_Consumer_Decision

Article Corporate Social Responsibility Impact on Consumer Decision

Thank you very much 

If you want to analyse CSR disclosure, then there is a possibility to calculate indexes based on content analysis.

Some examples:

Anas, A., Rashid, H. M. A., & Annuar, H. A. (2015). The effect of award on CSR disclosures in annual reports of Malaysian PLCs. Social Responsibility Journal.

Haniffa, R. M., & Cooke, T. E. (2005). The impact of culture and governance on corporate social reporting. Journal of accounting and public policy, 24(5), 391-430.