Based on standard database searches (including academic journals, technical standards, government records, and product registries), here are the most likely possibilities for what you are encountering:
However, there are also some limitations: DASS-243
as cited in specific academic literature (often designated by the citation number [243] in research papers). It is a widely used clinical and research instrument designed to measure the three related negative emotional states of depression, anxiety, and tension/stress. ResearchGate Review of the DASS Instrument and product registries)