User's Guide
Hygro-Thermometer
Model 45320
Introduction
Congratulations on your purchase of the Extech 45320 Hygro-Thermometer. The backlit
LCD displays temperature (in
Maximum and minimum temperature and relative humidity readings can be stored and
recalled. Careful use of this meter will provide years of reliable service.
o
C or oF) and relative humidity (%) simultaneously.
Specifications
Display Backlit E.L. (Electro-Luminance) LCD
Measurement ranges Temperature: 5.0
Relative Humidity: 25% to 95%
Accuracy Temperature: ±1.8
Relative Humidity: ±5%
Sensor types Temperature: Thermistor
Relative Humidity: Resistive
Max/Min mode Record/Recall highest and lowest temperature & relative
humidity readings
Over range indication Dashes ‘------‘ will appear on the LCD for temperature or
relative humidity if a measurement is out of range
Low battery indication Displayed battery symbol superimposed with an ‘X’
Power supply Two (2) ‘AA’ 1.5V Batteries
Battery life 1 year (typical)
Dimensions Meter: 5.25 x 2.75 x 1.00" (133 x 70 x 25mm)
Probe: 7” (178mm) length; 1” (25mm) width
Sensor cable length 39” (1m)
Weight 6.7 oz. (190g) with battery
o
F to 122.0oF (-15.0 oC to 49.9oC)
o
F (1oC)
Meter Description
1. Backlit LCD display
2. Push-button keypad
3. Probe in holder
4. Tilt stand and Battery compartment (rear)
Meter Operation
Meter Power
1. The 42530 is powered by two (2) ‘AA’ 1.5 V batteries.
2. Remove the protective decal that covers the LCD display by peeling it off by its corner.
3. Press the ON/OFF key to turn the meter on. If the display does not appear, check that
the batteries are installed and fresh. Note that a plastic tab, which must be removed
before use, may be installed in the battery compartment between one of the batteries
and the electrical contact.
4. Press the ON/OFF key again to turn the meter off.
Measurements
1. Slide the Temperature – Relative Humidity Probe up from its holder and hold it in the
air. Do NOT immerse the probe in liquid. Allow time for the readings to stabilize. Note
that the sensor need not be removed from its holder to operate.
2. The temperature (upper left) and relative humidity (right) measurements will appear on
the LCD.
3. The ‘Comfort Level’ display (Wet, Dry, or Comfort icons) will appear at the center of the
LCD. ‘Wet’ indicates that humidity is above 70%. ‘Dry’ indicates that the humidity is
below 40%; ‘Comfort’ indicates that the humidity is between 40% and 70%.
4. Note that the meter has a tilt stand located on the upper back area. Flip up the tilt stand
from its bottom edge for convenient desktop use.
Display Backlight
1. Press the backlight key (light bulb icon) to activate the display backlight. The backlight
will turn off automatically after approx. 5 seconds to conserve battery life.
2. Note that the backlight feature drains the batteries at a faster rate than normally would
be the case without the backlight turned on.
Selecting
oC/o
F units of measure
The temperature unit selector switch is located inside
meter). Open the compartment and slide the switch to the desired position (
LCD display will reflect the current selection.
the battery compartment (back of
o
C or oF). The
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