料位指示器 bin indicator; bin level detector; bin level indicator; bindicator; charge gauge; stock level height
零位指示器 fiducial indicator; left right indicator; left-right indicator; left-right instrument; null detector; null indicator; zero indicator; zero position indicator; zero reader
水位指示器 dip rod; dipper stick; dipstick; indicator for water level; levelmeter; water gage; water level detector; water level indicator; water level meter; water-gage; water-level indicator