ResearchMall is a platform that offers access to various research instruments for informational purposes exclusively, and not for commercial sale. Each research tool featured on the platform includes a description and credits the original author(s). Users are required to pay a fee of $3 for each item accessed and utilized, which supports the maintenance and operation of the website. This charge may be waived in the future if sponsorship opportunities become available. It is crucial to note that all research items displayed on the platform remain the intellectual property of their respective authors and are not owned by ResearchMall. Therefore, we encourage authors to submit their validated research instruments for display and citation.