How to Test a Manometer

Test the accuracy of your base unit with a manometer that is known to be accurate. This could be an extra, or a borrowed meter.

Connect the accurate unit to the Y test kit and then to your manometer. Test kits are available with a variety of different connections, making them compatible with most aneroid meters.

Inflate the test kit using the bulb at the tail of the Y. Take it up to 300mmHg.

Deflate the unit at five selected points, for instance, going from 300mmHg to 280mmHg, then to 260mmHg, 180mmHg, 100mmHg and finally 60mmHg.

Hold pressure at each point, comparing your reading with the reference standard. If your unit reads within 3mmHg at all points, it is considered accurate. If it exceeds this at any one point, the manometer should be re-calibrated by the factory that manufactured it.