Which of the following items should be checked on a manometer for proper function?

Ensuring that a manometer is functioning properly is crucial for accurate measurements during airtightness testing. Checking for leaking, blocks, or pinched tubes is essential because these issues can significantly affect the manometer's ability to measure pressure accurately. If the tubes are compromised, they may not provide the correct readings, leading to inaccurate results during testing processes.

While calibration state, battery life, and software updates could be relevant for the overall functioning of the equipment, the most immediate concern directly affecting the accuracy of the manometer during operation is the physical state of its components, such as the tubes used to measure pressure. Therefore, the integrity of the tubes is vital for ensuring reliable and precise measurements in airtightness testing.