Extech LT505 Instruction Manual
USER MANUAL
LUX/FC Light Meter
Model LT505
Additional User Manual Translations available at www.extech.com
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Introduction
Thank you for selecting the Extech Model LT505 LUX/FC Light Meter. The LT505 measures light
from fluorescent, metal halide, high-pressure sodium and incandescent sources in lux and footcandles. This device is shipped fully tested and calibrated and, with proper use, will provide years
of reliable service. Please visit our website (www.extech.com) to check for the latest version and
translations of this User Manual, Product Updates, Product Registration, and Customer Support.
Features
Measure intensity of light (illuminance) in lux or foot-candles
Light sensor with cosine correction
Low battery indicator
Data hold
Auto-ranging
Auto Power OFF (APO)
Light weight, compact, design
Safety
Please read the entire User Manual before operating this device. Use the meter only as specified
and do not attempt to service or open the meter housing.
Do not use the meter in the presence of explosive gas or vapor
Do not expose the meter to extremes in temperature or to high humidity
Please dispose of batteries and meter responsibly and in accordance with all applicable
laws and regulations
Do not allow children to handle the meter or the protective cover
Meter and LCD Description
1. Light Sensor (protective sensor cover not shown)
2. LCD
3. LUX-FC button
4. CAL-ZERO button
5. Power button
6. Data Hold button
7. MAX-MIN Record button
Note: Battery compartment and Tripod mount on rear of
meter
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1. Battery status
2. Auto Power OFF (APO)
3. Data Hold
4. Maximum reading
5. Average reading
6. Minimum reading
7. Measurement
8. Units of measure
9. Calibration (ZERO)
Operation
Meter Power
Power the meter by long pressing the button. The meter will begin displaying light intensity
readings. If the LCD does not switch on, check the batteries located in the rear battery
compartment. Short press power button to turn OFF the meter.
Zero Calibrate the Sensor
1. Place the protective cover over the sensor and press the
button to power on the meter.
2. If the display does not read ‘0.0’ short press the button.
3. The CAL icon will appear in the secondary display.
4. The CAL icon will switch OFF when the calibration has been completed.
5. If the protective cap is not covering the sensor when the button is pressed, the LCD
display will read “CAP”. In this case, please cover the sensor with the cap and restart this
procedure.
6. It is recommended that the meter be switched off and then on again when repeating the
zero calibration function.
Taking Measurements
Remove the sensor cover and aim the sensor toward the light source. View the measurement on
the meter’s display.
Selecting the Unit of Measure
Press the button to toggle the units between Lux and Foot-candles. The units will indicate in
the display.
Data Hold
Short press the button to freeze or unfreeze a reading on the display.
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