Extech Instruments DT40M User Manual page 19

and maintain the instrument lenses in the same manner as
for professional camera lenses with high quality lens wipes.
Battery Installation/Replacement
When the low battery symbol appears on the display or when
the display does not switch ON, replace the batteries.
1. Power OFF before replacing the batteries.
2. Open the rear battery compartment.
3. Replace the two (2) 'AAA' batteries observing correct polarity.
4. Replace the battery compartment cover.
Battery Safety
 Use only fresh batteries of the correct type. Remove old or weak
batteries so they do not leak and damage the unit.
 If the meter is to be stored for long periods, the batteries should be
stored separately to prevent damage to the unit.
 Never dispose of batteries in a fire. Batteries may explode or leak.
 Never mix battery types. Always install new batteries of the same
type.
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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