Attitudes Toward Mathematics Inventory (ATMI)
The Attitudes Toward Mathematics Inventory (ATMI) is a 40 question, 4-factor survey designed to measure high school and college students' attitudes toward mathematics. Unlike other math assessments, the ATMI was designed to be brief while also capturing multiple factors that contribute to one's attitude about math.
Average Review:
(3.8)
by anonymous,
, Harvard,

In terms of the comprehensibility, generally I think that this tool is easy to understand and navigate. Breaking up the statements somehow might make for easier completion, or just general better readability. Upon initial viewing, the list of 40 statements might appear daunting to certain individuals, and might reduce interest or reliability of responses.
This tool does seem to be appropriate for use in STEM research, but only concerning student attitudes towards the subject.
Since the tool asks for student attitudes, we know right off the bat that the responses will be self-reports concerning student feelings towards mathematics. It is difficult to see how to ensure for reliability or validity of self-reported responses in this instance.