403125 Datasheet, PDF (7/8 Pages) Extech Instruments Corporation. – Digital Light Meter

Maintenance
Battery Replacement
When the battery power falls below the operating voltage, the battery symbol appears on
the display. If the battery symbol appears on the LCD or if the LCD does not switch on
when the meter is turned on, replace the batteries as follows:
1. Remove the Phillips screw on the back of the meter.
2. Open the battery compartment.
3. Replace the four (4) ‘AAA’ 1.5V batteries observing polarity.
4. Replace the battery compartment cover and secure the compartment screw.
Cleaning
Use only a lightly damp cloth to clean the meter. Do not use abrasives, solvents, or harsh
detergents. Keep the plastic sensor dome clean and free from scratches; it may be
cleaned with a soft cloth and isopropyl alcohol.
Typical Light Levels (for general reference only)
Foot candles
> 10000
1000 to 10000
100 to 1000
10 to 100
1 to 10
0 to 1
Lux
> 107600
10760 to 107600
1076 to 10760
107 to 1076
10.7 to 107
0 to 10.7
Typical Light Levels
Sunlight
Operating Room
Assembly (fine)
Football stadium
Emergency room
Drafting table
Overcast day
Assembly (general)
Classroom
Casual reading
Shipping area
Stairwell
Auditorium
ATM machine
Storage room
Building entrance
Parking lot
Highway
Full moon
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403125 V3.1 9/06