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2. Spirometer - Wikipedia

   en.wikipedia.org/wiki/Spirometer

   They operate by measuring the speed of the airflow with techniques such as ultrasonic transducers, or by measuring pressure difference in the channel. These spirometers have greater accuracy by eliminating the momentum and resistance errors associated with moving parts such as windmills or flow valves for flow measurement.

3. Air flow meter - Wikipedia

   en.wikipedia.org/wiki/Air_flow_meter

   An air flow meter is a device similar to an anemometer that measures air flow, i.e. how much air is flowing through a tube. It does not measure the volume of the air passing through the tube, it measures the mass of air flowing through the device per unit time, though Thus air flow meters are simply an application of mass flow meters for the ...

4. Spirometry - Wikipedia

   en.wikipedia.org/wiki/Spirometry

   Flow measuring Spirometers. Fleisch-pneumotach; Lilly (screen) pneumotach; Turbine/Stator Rotor (normally incorrectly referred to as a turbine. Actually a rotating vane which spins because of the air flow generated by the subject. The revolutions of the vane are counted as they break a light beam) Pitot tube; Hot-wire anemometer; Ultrasound

5. Peak expiratory flow - Wikipedia

   en.wikipedia.org/wiki/Peak_expiratory_flow

   The measurement of peak expiratory flow was pioneered by Martin Wright, who produced the first meter specifically designed to measure this index of lung function. Since the original design of instrument was introduced in the late 1950s, and the subsequent development of a more portable, lower cost version (the "Mini-Wright" peak flow meter ...

6. Extech Instruments - Wikipedia

   en.wikipedia.org/wiki/Extech_Instruments

   The company's products include thermal imagers, multimeters, clamp meters, air flow meters, light meters, sound level meters, tachometers, pressure sensors, calibration devices, water quality meters, moisture meters, humidity meters, contact and non-contact thermometers, power supplies, fiber optic meters, and EMF measurement devices.

7. Ultrasonic flow meter - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_flow_meter

   Schematic view of a flow sensor. An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and ...