What device is used to measure draft?

The device used to measure draft is a manometer. A manometer specifically measures pressure differences, often in the form of a column of liquid such as water or mercury. In the context of measuring draft, which refers to the difference in pressure that creates airflow in chimneys or ducts, a manometer can accurately indicate the amount of draft present by showing pressure differentials.

A barometer measures atmospheric pressure, which does not directly relate to measuring draft within a venting system. A thermometer gauges temperature rather than pressure, making it unsuitable for measuring draft. While a pressure gauge can also measure pressure, it is generally used for measuring static or dynamic pressure in systems rather than specifically measuring draft as effectively as a manometer does. Therefore, the manometer is the most precise choice for measuring draft conditions.