Amprobe TMA-21HW User Manual page 5

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Air velocity sensor.
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Temperature and RH sensor.
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Telescoping probe.
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Display.
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Power key : Push
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H Hold key : Push H Hold key to freeze or unfreeze the display reading.
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In H mode, push "VEL %RH" key to select the desired unit of display.
TMA-21HW Hot-Wire Anemometer
power key to turn the meter on or off.
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