2Using the Handheld Infrared Thermometer
3.The target temperature and emissivity are displayed on the LCD. Determine the emissivity of the target (refer to Appendix B). Press the 
key to increment the target emissivity. Press the C F 
key to decrement the target emissivity.
4.Press the LOCK key to lock the trigger. The 
icon will appear on the display. This allows the thermometer to operate continuously whether or not the trigger is pulled. To unlock the trigger, press the
LOCK key again or pull the trigger twice. The 
icon is no longer displayed. When the trigger is pulled, the Laser Sighting as well as the display backlight will stay on .
5.After completing a temperature measurement, release the trigger. In order to conserve battery life, the thermometer goes into sleep mode and the Laser Sighting turns off.
2.2.1 Measurement Techniques
You can use the IR Thermometer to collect temperature data in any one of five different ways:
•Spot Measurement — Measures the temperature of discrete objects such as motor bearings, engine exhaust manifolds, etc.:
1.Aim at the desired target and pull the trigger.
2.If necessary, adjust the emissivity using the 
and C F 
keys.
3.Read the temperature.
•Differential Measurement — Measures the temperature differential between two spots (the maximum and minimum temperatures viewed)
1.Aim the thermometer at the first spot and pull the trigger. Press the LOCK key to lock the trigger.
2.If necessary, adjust the emissivity.
3.Aim at the second spot.
4.Adjust the emissivity of the second spot if required.
5.To display the differential temperature, press the FUNC key until “dIF” appears on the display.
6.Read the differential temperature from the upper display.
7.Press the LOCK key to unlock the trigger.