Related Clues:

• Fix a gauge
• Instrument panel part
• Ensure an accurate reading of
• Fine-tune an instrument
• Instrument to measure or test
• Estimate, form judgement of
• Measure against a standard
• Scale this sort of bail in a crate
• Can one measure a U in EGG?
• Make one's mark and graduate
• A you in the egg up there between the rails
• Box, boxing 1 across, born to measure
• Old pledge said to provide a standard
• Reading between the lines
• Correlate instrument readings with a standard to check accuracy