Changing Measurement Units; Data Hold Function; Lcd Backlight; Max/Avg Readings - Extech Instruments 250W Series User Manual

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Operation
Do not touch or otherwise obstruct the sensor area.
Do not allow liquids to come in contact with the sensor.
Avoid overly dusty environments.
Magnetic induction can affect the sensor's ability to operate correctly. Keep the sensor
away from magnetic fields.

5.4 Changing Measurement Units

To step through the air velocity units menu, short press the UNIT button. The
air velocity units are m/s (meters per second), km/h (kilometres per hour), ft/
min (feet per minute), mph (miles per hour), and knots.
Long press the UNIT button to toggle the displayed temperature units ℃ / ℉.

5.5 Data Hold Function

Short press the Data Hold (H) button to freeze/unfreeze the displayed read-
ings. While Data Hold is active, HOLD will appear on the LCD.

5.6 LCD Backlight

Long press the backlight button
Excessive use of the backlight will shorten battery life.

5.7 MAX/AVG Readings

When the device is switched on, it begins tracking the highest (MAX) and
average (AVG) readings.
Short press the MAX/AVG button to step through the MAX/AVG memories.
MAX is shown when the maximum reading is displayed and AVG is shown
when the Average reading is displayed. The memories are cleared each time
the meter power is cycled.
Press the MAX/AVG button again to exit this mode (MAX and AVG symbols
are both off when you exit).
#NAS100075; r. AA/78827/78827; en-US
CAUTION
to switch the display backlight on or off.
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