Discuss factors a researcher consider in selecting an existing instrument for use in a study

What factors must a researcher consider in selecting an existing instrument for use in a study?
How does a researcher locate an existing instrument?
Part Two: Search and locate an existing instrument that will be used to address your research question. Post the title of the instrument selected and the level of measurement on the tool. Next, post a description of the type of scale used in the instrument. Include a brief discussion of data collection procedures that will be presented in your proposal. (my instrument will be a questionarre. research a form of a questionarre I can use. No need to write this like a paper. Just answer the questions and provide citation