A professional who examines and gauges level vials for conformance to specifications and tests for leakage. Responsibilities include:

• Loads boxes of sealed vials into evaporating oven, and examines heated vials to detect fluid-loss due to leakage.
• Gauges length of vials, using go-not-go gauge, and examines vials for clarity of guidelines.
• Sorts completed vials according to position of bubble in relation to guidelines, to match vials in levels containing more than one vial.
• May be known according to specific task assigned as final inspector; tester; vial gauger.