Airflow meters

In engineering, the airflow or air flow is a measurement of the amount of air per unit of time that flows through a particular device.[1][2]

The amount of air can be measured by its volume or by its mass. Typically it is measured by volume, but for some applications it is necessary to measure it by mass, as air is a gas and therefore its volume can vary with temperature.

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Bante 903P portable multi-parameter meter used for measuring the pH, ORP and Dissolved Oxygen in water. General Features: Automatic Temperature Compensation (ATC) ensures highly accurate     measurements over the entire range. Calibration due reminder prompts you to calibrate the meter regularly. Automatic endpoint function freezes the stable measured values for     easy reading and recording data. Manual temperature calibration provides accurate temperature value. Help message as a operational guide to helps you understand how     to use meter. Setup menu lets user customizes buffer standards, calibration points,     stability conditions, resolution, temperature units, date and time to     meet measurement requirements. Reset function can resumes all settings to factory default values. Expanded memory stores and recalls up to 500 readings. Built-in real-time clock stamps stored data to meets GLP standards. Stored data can be transferred into computer via USB communication     interface.    ...