Excellent Solution For Surveying

DT-300K Series

All the Theodolite You’ll Ever Need

DT-300 Series
• High-accuracy measurements (5”, 7” and 9” models)
• Ultra-rugged IP66 dust and heavy rain protection
• Compact and light weight
• Long-lasting Li-ion or AA battery life
• Easy-to-use LCD backlit display(s)
• Precise laser pointer guidance
• Embedded tilt sensor for 5” and 7” models

Make your next job a snap
With the DT-300 you’ll be up and working fast, thanks to its simple interface and large, easy-to-see backlit LCD. There’s an optical plummet that makes set up over a control point easy, and a tilt sensor that provides ±3 minute angle correction. The DT-300 Series features two magnification choices of 26x and 30x, a super-short 3 ft. minimum focus distance for those tight areas, and angle accuracies of 5, 7, and 9 arc seconds.


Laser pointer
Add a whole new dimension of accuracy and confidence to your alignment jobs with our unique DT-300L Series featuring a red Class II laser beam. Use it anywhere on your site and see clearly in direct sunlight up to 165 ft. Now you can easily and accurately place anchor bolts at regular intervals on a line, set an angle and use the beam to verify your tape measure is properly aligned for the next stake, or “sight in” footers, frames, and tilt-up walls.


The ultimate in continuous operation
The DT-300/DT-300L Series provides up to 30 workdays of operation in Angle Measurement mode on 4 AA or optional Li-ion batteries, better than any other model. When it is time to change batteries, it’s as easy as snapping out the old ones and snapping in the new.\

Durability, accuracy, and value
The DT-300 Series represents the highest accuracy and value in digital theodolite technology. Our 80 plus years of experience manufacturing the world’s most precise optical survey instruments, shines through in the precision,  durability, and advanced technology found in each DT-300.
Water and dustproof
• IP66 rating
• Treated telescope to prevent moisture and eliminate lens fogging
• Rain proof
• Dust proof

Simple Operation
• Large, high-contrast, backlit LCD’s
• Simple five button interface panel
• Horizontal and vertical angles
• Slope by percent on angle

Laser accurate (L Series Only)
• Beam is emitted directly from the lens
• Bright red laser
• Pin-point accuracy

Long-lasting power options
• Up to 30 workdays of operation
• Topcon BDC Li-ion battery
• Or traditional AA batteries

Model DT-305K DT-305LK DT-309GK DT-309GLK
Telescope Length 149 mm 152 mm 149 mm 152 mm
Aperture 45 mm
Magnification 30X
Image Erect
Field of view 1°30’ (26 m/1,000 m)
Resolving power 2.5″
Minimum focus 0.9 m 1.0 m 0.9 m 1.0 m
Stadia ratio 100
Stadia constant 0
Angle measurement Method Rotary absolute encoder
Detecting Horizontal: 1 sides
Vertical: 1 sides
Minimum display 1″ (0.0002 gon/0.01 mil)/5″ (0.001 gon/0.1 mil) (selectable) 10″ (0.002 gon/0.05 mil)/20″ (0.005 gon/0.1 mil) (selectable)
Accuracy*1 5″ 9″
Display Unit 2 sides 1 sides
Tilt angle compensation Type Automatic vertical compensator
Range of compensation ±3′ (±0.0555 gon)
Compensation constant Can be changed (compensation is done at the same time with vertical angle 0 point)
Optical plummet Magnification 3X
Minimum focus 0.5 m
Sensitivity of levels Circular level 10’ /2 mm
Plate level 30″/ 2 mm
Temperature Operating temperature range -20 to 50°C (-4 to 122°F)*2
Storage temperature range -30 to 60°C (-22 to 140°F) (no condensation)
Environmental durability Dust and water protection IP66 (IEC 60529: 2001)
Power Supply (Standard) Power source 4 AA alkaline batteries
Working duration at 20°C (Standard) Theodolite only about 230 hours
Laser only about 80 hours about 80 hours
Theodolite and laser about 55 hours about 55 hours
Power Supply (Option) Power source 4 AA alkaline batteries
Working duration at 20°C (Standard) Theodolite only about 230 hours about 250 hours
Laser only about 80 hours about 80 hours
Theodolite and laser about 55 hours about 55 hours
Power Supply (Option) Power source BDC71 (Optional accessory)
Working duration at 20°C (Option) Theodolite only about 300 hours about 350 hours
Laser only about 100 hours about 100 hours
Theodolite and laser about 70 hours about 70 hours
Tribrach Type Detachable Fixing
Laser-pointer Signal source Red laser diode (633 nm) Red laser diode (633 nm)
Maximum output 0.6 mW 0.6 mW
Laser Class Class 2 Class 2
Laser beam range 50 m (in daylight) 50 m (in daylight)
Others Size (with handle) 173 (D) X 181 (W) X 318 (H) mm (Display on both sides) 173 (D) X 174 (W) X 318 (H) mm (Display on one side)
Weight 4.1 kg (9.04 lb) (with batteries and battery holder) 4.0 kg (8.82 lb) (with batteries and battery holder)

Download DT 300 Brochure