Extech Instruments 42545A, User Manual

Model 42545

A

 V4.1   02/08 

4 

Operating Instructions 

Basic IR Measurements 

1.  Hold the meter by its handle and point it toward the surface to be measured. 

2.  Pull and hold the trigger to turn the meter on and begin testing. The temperature 

reading, the flashing ‘SCAN’ icon, the emissivity, and the unit of measure will appear. 
Note: Replace the 9V battery if the display does not switch on. 

3.  Release the Trigger and the reading will hold for approximately 7 seconds (HOLD will 

appear on the LCD) after which the meter will automatically shut off. The only 
exception to this is if the TEST LOCK switch is set to ON. 

Note

: Select the temperature units (ºF/ºC) using the top switch inside the battery 

compartment 

Backlight/Laser Pointer 

1.  While pulling the Trigger, push the backlight/laser button          once to turn on the 

backlight.

2.  Press it again to turn on the laser pointer. When the laser is ON the laser icon     will 

appear in the LCD.

3.  Press the laser button to turn the backlight off.

4.  Pressing it again turns the laser off.

Note

: Backlight and Laser settings will be retained after the meter powers down. 

Over-range Indication 

If the temperature measurement exceeds the specified temperature range, the 
thermometer will display dashes in place of a temperature reading.