Extech DT300 Operating Manual

User Guide

Laser Distance Finder

Extech DT300

Introduction

Congratulations on your purchase of the Extech Model DT300 Laser Distance Finder.
This meter measures Distance up to 164 ft (50m) and calculates Area and Volume. In
addition, the DT300 includes a laser pointer for accurate targeting. This meter is shipped
fully tested and calibrated and, with proper use, will provide years of reliable service.

Safety Instructions

This meter has been designed for safe use, but must be operated with caution.

WARNING: Do not directly view or direct the laser pointer at an eye. Low power visible

lasers do not normally present a hazard, but may present some potential for hazard if
viewed directly for extended periods of time.

Laser classification (Class 2)

The DT300 produces a visible Class 2 laser beam from
the top of the instrument. Do not stare into the laser
beam or direct the beam toward anyone’s eyes. Eye
protection is normally an automatic response (‘blink
reflex’, for example).

Warning: Do not look directly into the laser beam using
optical aids such as binoculars or telescopes. This can create a hazard.

Permitted Uses

• Measure Distances

• Compute Area and Volume

• Measure Angles

Prohibited Uses

• Exceeding the specified measurement limits

• Compromising or deactivating the safety systems built into the meter

• Removal of hazard or explanatory labels affixed to the meter

• Modifying or converting the instrument

• Using third party accessories

• Operation on scaffolding or ladders without proper safety precautions

• Measuring near machines that are operating or near parts of machine installations

that are unprotected

• Aiming the meter into the sunlight

• Outdoor measurements or measurements on roads, near construction sites, etc.

without adequate safeguards

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Model DT300 V1.0 11/09

Meter Description

Front Panel

1. Laser Pointer

2. Laser Test Beam

3. LCD display area

4. Keypad (described below)

5. Battery compartment on rear of instrument

Display

1. Laser Status icon appears when laser is active

2. Reference level (Top)

3. Reference Level (Bottom)

4. Area, Volume, and Indirect Measurement icons

5. Single Distance Measurement mode

6. Battery status icon

7. Reading Memory Location Number

8. Error icon

9. Continuous MIN-MAX measurement mode

10. Display Line 1

11. Display Line 2

12. Display Line 3 (Summary Display Line)

Keypad

Power ON / Measurement Button
CLEAR / Power OFF Button
Measurement Reference Button
Backlight / Unit Button
MAX-MIN Continuous Measurement Button
Indirect Measurement Button
Memory Button

Add/Subtract Buttons

Area-Volume Button

1

2

3

4

5

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Model DT300 V1.0 11/09

Operating Instructions

Measurement Considerations

1. For best results, choose a target that is flat, hard and smooth

2. Use a section of cardboard or similar material if the target size needs to be increased

3. Replace the battery if the battery icon appears on the display

4. The meter will not measure through glass, liquid, or Styrofoam

5. Inaccurate measurements may result from any of the following:
Low battery

•

Measured distance exceeding specified range

•

Irregular shaped objects near the target

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Preparation for Measurements

1. Press the MEAS button

to switch the meter ON. The unit automatically switches

OFF after three (3) minutes of inactivity.

2. Press and hold the UNIT button

to change the unit of measure (ft = feet, in =

inches, m = meters, and ‘ “ (feet and inches).

3. Use the reference button
In the Top mode (2), the displayed reading will represent the distance from the top

•

to select the Top or Bottom distance reference.

of the meter to the target.

In the Bottom mode (1), the displayed reading will represent the distance from the

•

bottom of the meter to the target.

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Single Distance Measurement

1. Momentarily press the MEAS button to switch the meter ON; Dashes (- - -) will appear

on the display and the Laser pointer will switch ON.

2. Aim the meter and momentarily press the MEAS button again to take and display a

reading.

3. The reading will remain on the display for 60 seconds.

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Model DT300 V1.0 11/09