Primary definition
(ES&S, opscan) A component of certain models of ES&S optical scanners used to adjust the guide arm that holds ballots in place as the input hopper rises while ballots are being read.
Also known asup-stop knob · up stop knob · upstop adjustment knob · ballot guide arm adjustment knob · ES&S upstop
1 sources cited4 related termsReviewed Aug 9, 2026
— Electronic Voting GlossaryView source
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EVG
Carnegie Mellon University
(ES&S, opscan) A component of certain models of ES&S optical scanners used to adjust the guide arm that holds ballots in place as the input hopper rises while ballots are being read.
Electronic Voting Glossary · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Upstop Knob. In Election Security Glossary. Retrieved August 22, 2026, from https://electionsecurityglossary.com/glossary/upstop-knob
Sources
1 cited · last checked Aug 9, 2026
01
Electronic Voting Glossary
Electronic Voting Glossary
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