When shopping for an affordable automotive diagnostic scanner, the Delphi DS100E and DS150E often come up as popular choices for hobbyists, home mechanics, and small shops. Both are entry-to-mid-level scan tools from a brand with a long history in vehicle diagnostics, and they target similar users: people who want OBD-II reading and basic system diagnostics without the expense of professional-level equipment. This article compares the two across features, usability, vehicle coverage, software, build quality, and value to help you decide which one matches your needs.