User Manual

LT40-EN v1.3 9/13
6
Measurement Considerations and User Tips
 For maximum accuracy allow the light being measured to fall directly on the sensor as
perpendicular as possible with a minimal angle of incidence.
 When the meter is not in use please keep the protective cap in place over the light sensor.
This will prolong the life of the sensor.
 When the meter is to be stored for long periods, please remove the batteries and store them
separately. Batteries can leak and cause damage to the meter’s components.
 Avoid areas of high temperature and humidity when using this instrument.
Battery Replacement and Maintenance
Cleaning and storage
1. The white plastic sensor dome should be cleaned with a damp cloth when necessary. Use
only a mild soap if needed. Do not use solvents, abrasives, or harsh detergents to clean the
dome.
2. Store the meter in an area with moderate temperature and relative humidity.
Battery Replacement
When the battery power decreases to a critical level, the low battery symbol “ ”will appear on
the LCD. Replace the 2 x 1.5V AAA batteries located in the rear battery compartment. The
battery compartment slides easily downward for removal. Ensure that the compartment cover is
securely fastened before using the meter.
Battery Safety Reminders
o Please dispose of batteries responsibly; observe local, state, national regulations.
o Never dispose of batteries in a fire; batteries may explode or leak.
o Never mix battery types; install new batteries of the same type.