Extech 445580, 445582 Instruction Manual
INSTRUCTION MANUAL
Model 445580 & 445582 (kit)
Hygro-Thermometer Pen
1. INTRODUCTION
Congratulations on your purchase of the Extech Hygro-Thermometer Pen. This portable
meter can measure RH from 5% to 95% and Temperature from 14 to 113oF (-10 to 45oC).
Advanced features include MIN/MAX Memory, Push-button Calibration, Display Hold, and
Automatic Power Off. The Model 445582 kit includes Calibration bottles and hard shell
carrying case.
2. SPECIFICATIONS
RH Sensor High Precision thin-film capacitance type
Temperature Range 14 to 113oF (-10 to 45oC)
RH Range 5 to 95% RH
Resolution Temperature: 0.1o; RH: 0.1%
Accuracy Temperature: ±1.0oC; RH: ±5% (@25oC)
DC Power 2032 button battery (150 hour battery life)
Response time 120 seconds
Dimensions 6.9 x 1.6 x 0.6" (175x42x16mm)
1 445580/82 Ver. 1.7 02/01
3. METER DESCRIPTION
1. RH/Temperature Sensor
2. POWER ON/OFF button
3. Data Hold button
4. MIN/MAX Memory button
5. Calibration and units
select push-button
6. Memory Reset button
7. RH Display
8. Temperature Display
9. Function Displays
4. OPERATION
4.1 Meter Power
Turn the meter ON by pressing the ON/FF button. If the display does not light up and
initialize, check the battery. Once powered, the meter will display RH in the upper portion
of the LCD. The temperature reading will appear (smaller) in the lower portion of the LCD
in oC or oF.
4.2 Default Temperature Units (C/F) Selection
Press and hold the F/C key (use a paper clip or similar object to press this key) while
turning power on. Release the F/C key when the F and C appear in the display. Press the
MIN/MAX key to select the small C or F on the display. Press the "F/C" key to save the
selection. Turn off the meter ensuring that the RESET key is not pressed by mistake
since this will corrupt the meter's calibration.
4.3 Data Hold
To freeze the displayed reading, press and hold the HOLD key until the “HLD” icon
appears on the display. The current reading will remain on the display. Press and hold
the RESET key until the “HLD” icon disappears from the display to return the meter to
normal operation.
4.4 MIN/MAX Memory
To view MIN/MAX readings, press and hold the MIN/MAX key until the “MIN” display icon
appears. The reading will then be the lowest humidity and temperature measurements
made since the meter was powered up or last reset. Press and hold the MIN/MAX key
until the “MAX” icon appears on the display to view the maximum humidity and
temperature readings since the meter was powered up or last reset. Press the MIN/MAX
key again to return to normal operation.
4.5 Memory Clear
To reset (clear) the MIN/MAX memory, press and hold the RESET key until the meter re-
initializes (all display icons appear at once). The MIN/MAX memory is now cleared.
4.6 Automatic Power Off (Sleep mode)
The meter will automatically shut down after a period of non-use (approx. 20 seconds). To
defeat this mode, press and hold the MIN/MAX key while powering the unit. Release the
ON/OFF key after the display initializes. 'n' will appear on the LCD indicating that the nonsleep mode has been activated. Sleep mode will be re-activated after the meter is
powered down however.
2 445580/82 Ver. 1.7 02/01
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