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before use. A battery pack may also slowly lose its charge if left in a charger that is
not plugged into an appropriate AC source.
WEAK BATTERY PACKS: Chargers can also detect a weak battery pack. Such
batteries are still usable but should not be expected to perform as much work. The
charger will indicate to replace battery pack.
Important Charging Notes
1. Longest life and best performance can be obtained if the battery pack is charged
when the air temperature is between 18°- 24°C (65°F and 75°F). DO NOT charge
the battery pack in an air temperature below +4.5°C (+40°F), or above +40.5°C
(+105°F). This is important and will prevent serious damage to the battery pack.
2. The charger and battery pack may become warm to touch while charging. This
is a normal condition, and does not indicate a problem. To facilitate the cooling
of the battery pack after use, avoid placing the charger or battery pack in a warm
environment such as in a metal shed, or an uninsulated trailer.
3. If the battery pack does not charge properly:
a. Check operation of receptacle by plugging in a lamp or other appliance;
b. Check to see if receptacle is connected to a light switch which turns power off
when you turn out the lights;
c. Move charger and battery pack to a location where the surrounding air
temperature is approximately 18°- 24°C (65°F - 75°F);
d. If charging problems persist, take the tool, battery pack and charger to your
local service center.
4. The battery pack should be recharged when it fails to produce sufficient power
on jobs which were easily done previously. DO NOT CONTINUE to use under
these conditions. Follow the charging procedure. You may also charge a partially
used pack whenever you desire with no adverse affect on the battery pack.
5. Foreign materials of a conductive nature such as, but not limited to, grinding
dust, metal chips, steel wool, aluminum foil, or any buildup of metallic particles
should be kept away from charger cavities. Always unplug the charger from the
power supply when there is no battery pack in the cavity. Unplug charger before
attempting to clean.
6. Do not freeze or immerse charger in water or any other liquid.
WARNING: Shock hazard. Don't allow any liquid to get inside charger. Electric
shock may result.
CAUTION: Never attempt to open the battery pack for any reason. If the plastic
housing of the battery pack breaks or cracks, return to a service center for recycling.
Storage Recommendations
1. The best storage place is one that is cool and dry away from direct sunlight and
excess heat or cold.
2. Long storage will not harm the battery pack or charger. Under proper conditions,
they can be stored for 5 years or more.
SAVE THESE INSTRUCTIONS FOR FUTURE USE
Emissivity
Emissivity describes the energy-emitting characteristics of materials. Most organic
materials and painted or oxidized surfaces have an emissivity of about 0.95 which
is the default setting. It is recommended to compensate for inaccurate readings that
may result from measuring materials with low emissivity values such as shiny metal
surfaces. Cover these surfaces with masking tape or flat black paint (<148°C/300°F)
and use the default (0.95) setting. Allow time for the tape or paint to reach the same
temperature as the surface beneath it and then measure the temperature of the tape or
painted surface.
If you cannot paint or use tape, then you can compensate your measurements with
the emissivity selector. Even with the adjustable emissivity, it can be difficult to get a
completely accurate infrared measurement of a target with a shiny or metallic surface.
Experimentation may be required to benchmark temperatures, and experience will help
you choose the best setting for specific measurements.
The thermometer has emissivity adjustable from 0.1 to 1.0 in increments of 0.01.
Refer to the Nominal Emissivity Table in this manual. The reference to emissivity
settings in the table are suggestions for typical situations and your particular situation
may differ.
NOTE: Calibration of this product was performed at 0.95 emissivity.
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