Johnson LDM85 - User Manual

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Thank you for purchasing this Johnson 85’ Laser

Distance Meter - the fastest way to measure your

jobsite.

ATTENTION:

• Read all instructions before operating this tool. Do not

remove any labels from the tool.

• Do not project the laser into the eyes of others.

• Do not set up laser tool at eye level, or operate the tool

near reﬂective surfaces, as the beam can be projected

into your eyes or the eyes of others.

• Do not place the laser tool in a manner that may cause

someone to unintentionally look into the laser beam.

Serious eye injury may result.

• Do not operate the tool in explosive environments, (i.e.,

in the presence of gases or ﬂammable liquids).

• Keep the laser tool out of the reach of children and

other untrained persons.

• Do not attempt to view the laser beam through optical

tools such as telescopes - serious eye injury may result.

• Always turn o the laser tool when not in use or when

left unattended for any period of time.

• Disassembly or repair by unqualiﬁed persons will void

the warranty.

• Power on the LDM85 by pressing or .

• Set your desired operating units by holding

until the desired unit is reached, then release.

• Set the measurement reference by pressing

and simultaneously. The tool will indicate the

current reference position:

• Set your operating mode by pressing . See

the TAKING MEASUREMENTS section for more

information on the dierent operating modes.

• Take your measurements by pressing .

• When completed, power o the tool by holding

. The tool will auto-power o in 5 minutes.

LDM85 Operator’s Manual

Download this manual at

www.johnsonlevel.com/manuals

Press to take a measurement. Hold

to adjust units.

Press to power on. Press to adjust

operating mode. Hold to power o.

Press both buttons to adjust

measurement reference.

SAFETY INFORMATION

The LDM85 uses two “AAA” batteries that last for

up to 10,000 measurements, depending on usage.

To insert batteries:

• Depress the knurled area of the

battery door, and slide the battery

door o the tool.

• Insert 2xAAA batteries according

to the indicated polarity, and

replace the cover.

• The tool will indicate remaining power at startup:

0-10% 50-75%10-50% 75-100%

NOTE: When storing the tool for more than three

months, remove the batteries to prevent corrosion.

MAIN COMPONENTS

LCD OVERVIEW

INSTALLING BATTERIES

BUTTON OVERVIEW

GETTING STARTED

EN 60825-1:2007 & EN 60825-1:2014

650nm / Power < 1mW

CLASS 2 LASER PRODUCT

AVOID EXPOSURE

Laser radiation is emitted

from this APERTURE

Complies with 21

CFR 1040.10 and

1040.11 except for

deviations pursuant

to Laser Notice No.

50, dated June 24,

2007.

This Class II laser tool complies with CRF 21 parts 1040.10

and 1040.11, IEC 285, and EMC Tests EN61000-6-3;

2001+A11:2004, EN6100-6-1:2011, EN6100-4-2, EN61000-

4-3, EN 60825 & FCC Test Part 15.

LASER EMITTING WINDOW

LCD

MEASURE BUTTON

POWER BUTTON

LASER INDICATOR

REFERENCE INDICATOR

BATTERY STATUS

UNIT DISPLAY

SUB DISPLAY

MAIN DISPLAY

LASER RECEIVING WINDOW

FRONT EDGE REFERENCE

REAR EDGE REFERENCE

THIS TOOL EMITS LASER RADIATION. DO NOT

STARE INTO BEAM. AVOID DIRECT EYE EXPOSURE.

SAFETY LABEL LOCATION

MEASURE

POWER

REF

Need help?

Do you have a question about the Johnson LDM85 and is the answer not in the manual?

Summary

Safety Information

Laser Safety Warnings

Direct warning about laser emission and avoiding eye exposure.

General Operating Precautions

Guidelines for safe operation, including avoiding eye projection, safe environments, and child safety.

Main Components and LCD Overview

Component Identification

Identifies key physical components of the LDM85, including windows, LCD, and buttons.

LCD Display Elements

Details the elements of the LCD screen, including main and sub displays, status indicators, and unit display.

Taking Measurements

Measurement Modes

Explains how to select and use modes like Length, Area, Volume, and Continuous measurement.

Pro Tips for Measurement

Provides advice on holding the tool steady, bright light conditions, and checking references.

Troubleshooting

Error Codes Explained

Details common error codes (Err01-Err06) and their meanings, including signal issues and range limits.

Product Registration and Warranty

Product Registration

Instructions and benefits for registering the product within 30 days of purchase.

Product Warranty Information

Details the two-year limited warranty, service center information, and required proof of purchase.

Summary

Safety Information

Laser Safety Warnings

Direct warning about laser emission and avoiding eye exposure.

General Operating Precautions

Guidelines for safe operation, including avoiding eye projection, safe environments, and child safety.

Main Components and LCD Overview

Component Identification

Identifies key physical components of the LDM85, including windows, LCD, and buttons.

LCD Display Elements

Details the elements of the LCD screen, including main and sub displays, status indicators, and unit display.

Taking Measurements

Measurement Modes

Explains how to select and use modes like Length, Area, Volume, and Continuous measurement.

Pro Tips for Measurement

Provides advice on holding the tool steady, bright light conditions, and checking references.

Troubleshooting

Error Codes Explained

Details common error codes (Err01-Err06) and their meanings, including signal issues and range limits.

Product Registration and Warranty

Product Registration

Instructions and benefits for registering the product within 30 days of purchase.

Product Warranty Information

Details the two-year limited warranty, service center information, and required proof of purchase.

The Johnson LDM85 is a Class II laser distance meter designed for quick and accurate measurements on job sites. It complies with CRF 21 parts 1040.10 and 1040.11, IEC 285, and EMC Tests EN61000-6-3; 2001+A11:2004, EN6100-6-1:2011, EN6100-4-2, EN61000-4-3, EN 60825 & FCC Test Part 15.

Function Description:

The LDM85 measures distances using a laser, providing a fast way to obtain measurements for various applications. It supports multiple measurement modes:

Length: Measures a single length. The user presses the measure button to activate the laser and take a reading. Pressing the button again re-enables the laser for the next measurement.
Area: Calculates the area based on two measurements. This is useful for estimating drywall, paint, or flooring needs. The user presses the measure button to record the first length, then presses it again to record the second length. The tool then displays the calculated area.
Volume: Calculates volume based on three measurements, suitable for HVAC applications. The user presses the measure button to record each of the three lengths, and the tool displays the resulting volume.
Continuous: Displays instantaneous length measurements. The user presses the measure button to start continuous measurement and presses it again to pause and hold the current measurement on the LCD.

Important Technical Specifications:

Laser: Class II, <1mW, 650nm.
Accuracy: +/- 5/64" (approximately +/- 2mm).
Range: 2" to 85' (approximately 0.05m to 25.9m).
Modes: Length, Area, Volume & Continuous.
Units: Meters (m), feet (ft), inches (in) with fractional precision (1/8", 1/16", 1/32").
Operating Temperature: 23°F to 104°F (-5°C to 40°C).
Storage Temperature: -4°F to 160°F (-20°C to 70°C).
Batteries: 2xAAA.
Battery Life: Up to 10,000 measurements.
Dimensions: 3.9" x 1.4" x 0.9" (approximately 9.9cm x 3.6cm x 2.3cm).
Weight: 2 5/8 oz. (with batteries) (approximately 74.4g).
IP Rating: IP54 (rainproof).

Usage Features:

The LDM85 features a clear LCD display that shows the main measurement, sub-display information, unit display, laser indicator, reference indicator, and battery status.

Controls:
- Measure Button: Used to take measurements. Holding it down adjusts units.
- Power Button: Used to power on the device. Pressing it adjusts the operating mode. Holding it down powers off the device.
- Combined Button Press (Measure + Power): Used to adjust the measurement reference.
Power On/Off: Press the power button to turn on. Hold the power button to turn off. The tool auto-powers off after 5 minutes of inactivity.
Unit Selection: Hold the measure button until the desired unit (m, ft, in, 1/8", 1/16", 1/32") is reached, then release.
Measurement Reference: The tool can measure from the front edge or the rear edge. To set the reference, press both the measure and power buttons simultaneously. The LCD will indicate the current reference position (front edge or rear edge).
Battery Installation: The LDM85 uses two AAA batteries. To install, depress the knurled area of the battery door, slide it off, insert batteries according to polarity, and replace the cover. The tool indicates remaining power at startup (0-10%, 10-50%, 50-75%, 75-100%).
Pro Tips:
- Always hold the tool steady, preferably against a stable surface.
- In bright sunlight, the full 85' range may not be achieved.
- In bright conditions, aim at reflective surfaces to improve beam visibility.
- Always check the measurement reference to avoid errors.

Maintenance Features:

Battery Care: Remove batteries if storing the tool for more than three months to prevent corrosion.
Troubleshooting:
- Tool not powering on/remaining on: Replace batteries, check battery polarity.
- Incorrect measurements (by ~4 inches): Check and adjust the measurement reference.
- Error Codes ("Err" + number):
  - Err01: Tool's operating range exceeded.
  - Err02: Weak return laser signal. This can be caused by a dirty receiving window, non-porous targets (like cinder blocks, carpet, foam), or high ambient light. Ensure the receiving window is clean and use a reflective target or white sheet over porous surfaces if needed.
  - Err03: Value exceeds LCD display capacity.
  - Err04: Low battery.
  - Err05: Tool is outside temperature range.
  - Err06: Ambient light is too high to operate.
Safety:
- This tool emits laser radiation. DO NOT STARE INTO BEAM. AVOID DIRECT EYE EXPOSURE.
- Read all instructions before use.
- Do not remove labels.
- Do not project the laser into others' eyes.
- Do not set up at eye level or near reflective surfaces.
- Do not place the tool where someone could unintentionally look into the laser beam.
- Do not operate in explosive environments.
- Keep out of reach of children and untrained persons.
- Do not view the laser beam through optical tools.
- Turn off when not in use or unattended.
- Disassembly or repair by unqualified persons voids the warranty.
Warranty: Johnson Level & Tool offers a two-year limited warranty. Non-warranty repairs and calibration must be done by an authorized service center. The user is responsible for proper use, care, and verifying calibration before each use.