Battery Replacement And Maintenance - Extech Instruments LT40 User Manual

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.
1. Press and hold the battery compartment lock button (see diagram).
2. Slide the battery compartment cover off in the direction of the
arrow.
Install two (2) 1.5V 'AAA' batteries observing correct polarity and close
the battery compartment. Ensure that the compartment cover is securely
fastened before using the meter.
Never dispose of used batteries or rechargeable batteries in
household waste.
As consumers, users are legally required to take used batteries to appropriate
collection sites, the retail store where the batteries were purchased, or wherever
batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take
end‐of‐life devices to a designated collection point for the disposal of electrical and electronic
equipment.
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