UNI-T LM A Series Laser Distance Meters

Safety Information

Before using the meter for the first time, please read the safety information and operating instructions carefully.

• Use the meter only as specified in this manual. Otherwise, it may cause damage to the meter, affect measurement accuracy and result in personal injury.
• Do not disassemble or repair the meter without authorization. Do not refit or change the performance of the laser transmitter illegally. Please keep the meter properly, do not place it where children can reach it, and avoid use by irrelevant personnel.
• Do not irradiate the laser at eyes and other parts of the body, and on the surface of highly reflective objects.
• The electromagnetic radiation of the meter may cause interference to other equipment. Please do not use the meter near airplanes, medical equipment or in flammable and explosive environments.
• The replaced batteries and discarded meters cannot be disposed of together with domestic garbage. Please dispose of them in accordance with relevant national or local laws and regulations.
• If the meter has any quality problems, or if users have any questions about the use of the meter, please contact the local dealer or manufacturer in time.

Product Introduction Display

Batteries

1. Open the battery door on the back of the meter, install the battery according to the polarity instructions, and close the battery door.
2. The meter can only use 1.5V AAA alkaline batteries.
3. When the meter is not used for a long time, please take out the battery to prevent it from corroding the meter’s main body.

Power On and Function Settings

1. Power On/Off
   In the shutdown state, press , the meter and the laser will be started at the same time.
   In the power-on state, press and hold 0• for 3 seconds to turn off the meter. If no operation is performed within 150 seconds, the meter will automatically shut down.
2. Unit Settings
   Long press ,, to enter the unit setting state and the current unit can be reset. The default unit of the meter is 0.000m. There are 6 optional units.

Measurement units

Measurement Reference Settings
Short press”‘ to measure from front or end. The default setting is end measurement.
Backlight
The backlight is automatically turned on and off. It will turn on for 15 seconds when any button is pressed. The backlight will automatically turn off if there is no operation after 15 seconds to save power.
Sound
Long press ( to turn on or off the sound of the beeper).
Self-Calibration
Self-calibration function can ensure the measurement accuracy. Calibration method: In the shutdown state, press and hold ‘“, and then short press to turn on the meter. When the screen shows ‘ ‘ with a  flashing number at the bottom, the meter enters the self-calibration mode. At this time, users can press+ ;i to calibrate values according to the error of the meter. Calibration range: -9-9mm
Examples: The actual distance is 3.780m. f the measured value is 3. 778m, which is 2mm smaller than the actual value, press + to increase the calibration value by 2mm. f the measured value is 3. 783m, which is 3mm larger than the actual value,  press j to lower the calibration value by 3mm. After adjustment, press to save the calibration results.
Measurement Modes

• Single Measurement
  • While the meter is on, press to transmit the laser. Press again to make  the distance measurement. The measurement results will show on the primary display.
  • Continuous Measurement
  • While the meter is on, long press  to enter the continuous measurement tate. The maximum and minimum values during the measurement will show on the secondary display. The measurement results will show on the primarydisplay. Short press or ”‘ to exit the continuous measurement.
• Area Measurement
  • Press FUNC 1x. The symbol will appear on the display and one side of the rectangle will flash. Press to make the first measurement (length). Press again to make the second measurement (width). The meter will automatically calculate the area, and the result will show on  the primary display. The length and width will show on the secondary display.  During the measurement process, press to clear the measurement result and re-measure. Press to exit the area measurement and enter the length  measurement mode.
• Volume Measurement
  • Press FUNC 2x. The Ell symbol will appear on the display.
  • Press to make the first measurement (length).
  • Press  again to make the second measurement (width).
  • Press again to make the third measurement (height).
  • The meter will automatically calculate the volume, and the result will show on the primary display. The length, width and height will show on the secondary display.
  • During the measurement process, press•??• to clear the measurement result  and re-measure.
  • Press to exit the volume measurement and enter the length measurement mode

Indirect Measurement

• Measure the hypotenuse and base-side, indirectly measure the height
  • Press FUNC 3x.
  • Pressto measure the length of the hypotenuse (a).
  • Press to measure the length of the base-side (b).
  • The meter will automatically calculate the length of the leg (x).
• Measure the leg and base-side, indirectly measure the hypotenuse Press FUNC 4x
  • Press to measure the length of the leg (a).
  • Press to measure the length of the base-side (b).
  • The meter will automatically calculate the length of the hypotenuse (x).
• Press FUNC 5x, the hypotenuse flashes A
  • Press to measure the length of the hypotenuse (a).
  • Press to measure the length of another hypotenuse {b ).
  • Press to measure the length of the base-side ©.
  • The meter will automatically calculate the length of the leg (x).
• Press FUNC 6x, the hypotenuse flashes
  • Pressto measure the length of the hypotenuse (a).
  • Press to measure the length of the base-side (b ).
  • Press to measure the length of another hypotenuse ©.
  • The meter will automatically calculate the length of the leg (x).
    In the Pythagorean measurement mode, the length of the leg must be less than the length of the hypotenuse; otherwise the meter will display an error signal prompt. In order to ensure the measurement accuracy, users should make sure to measure from the same starting point and in the order of hypotenuse and leg.

Addition/Subtraction

• The single distance measurement values can be added or subtracted. After getting the result when taking a single distance measurement, press + i to enter the addition/subtraction mode.
• Short press +, the “+” symbol will show on the primary display, and then it will enter the addition mode. The addition value of the last and the current measurement values will show on the display.
• Short press , the ” – • symbol will show on the primary display, and then it will enter the subtraction mode. The subtraction value of the last and the current measurement values will show on the display.
• Not only the distance can be added and subtracted, but also the area and the volume.
• Area addition: Measure the first area and get the result, as shown in Figure 1 below. Then press to measure the second area and get the result, as shown in Figure 2 below, and a plus sign will be displayed in the lower left corner. Finally, press to get the result of adding these two areas, as shown in Figure 3. The addition and subtraction of volume is similar to it.

Data Storage

• If the current data is valid when measuring, press and hold for 3 seconds, and the data will be automatically stored in the meter memory. In the area, volume and indirect measurement modes, the data can also be stored after all the tests are over. At this time, the meter will store the complete measurement record under this mode.

View/Delete Data

• Short press to query the stored data. Press + to scroll forwards, and press to scroll backwards. When viewing data, short press c to delete the current record, and long pressto delete all records. Press It or to exit.

Error Codes

Specifications

“d” means actual distance.
Under harsh environments, such as excessive sunlight and ambient temperature fluctuations, weak reflection on reflective surfaces, and insufficient battery power, the measurement results will have errors. At this time, using the target reflector can improve the measurement accuracy.

Maintenance

Do not place the meter in a high temperature and humidity environment for a long time. When not using the meter for a long time, please take out the battery and put the meter in the carrying bag, and store it in a cool and dry place.
Remove dirt with a moist, soft cloth. Do not use aggressive detergents or solutions. The laser window and focusing lens can be wiped according to the method of wiping the optical device.

Packing List

All accessories are shown in the table below.

MORE INFO

• No. 6, Gong Ye Bei 1st Road, Songshan Lake National High-Tech Industrial Development Zone, Dongguan City, Guangdong Province, China

Documents / Resources

UNI-T LM A Series Laser Distance Meters [pdf] User Manual LM50A, LM70A, LM100A, LM120A, LM A Series Laser Distance Meters, LM A Series, Laser Distance Meters, Distance Meters

References

• User Manual