Northwest Instrument 5″ Digital Transit-Theodolite (5 Second Accuracy) NETH503


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Overview for the Northwest Instrument 5″ Digital Transit-Theodolite (5 Second Accuracy)

With 5-second accuracy, the Northwest Instrument NETH503 Theodolite is capable of precisely measuring angles in horizontal and vertical planes. It has an integrated advanced glass encoder, single-axis tilt sensor, dual backlit LCD screens and built-in optical plummet for fast and accurate setup.

Precise Angle Measurements

The NETH503 digital theodolite features photoelectric incremental encoding that generates a precisely defined number of pulses to measure angular direction of movement. This highly advanced technology ensures the most precise and reliable measurement of angles.

Telescope and Tilt Sensor

Its powerful telescope with illumination features 30x magnification and 4-inch resolving power, producing crystal clear and bright images even in low light. This advanced surveying tool also has an integrated tilt sensor that monitors shifting and errors in vertical angles.

Control Panel

For quick and easy digital readout of both horizontal and vertical angles, the NETH503 features double-sided LCD displays and keypad. The large keys enable construction and surveying professionals to convert degrees and percentage grades and easily access the horizontal-zero slope function.

Long Battery Life

The NETH503 works up to 80 hours using four AA alkaline batteries . You can also purchase a rechargeable NiMH battery pack and battery charger for longer operating time.

This Northwest Instrument theodolite package comes with a hard carrying case, tool kit, alkaline batteries and 1-year manufacturer’s warranty.

What’s in the Box

Northwest Instrument NETH503 5 second theodolite
Hard carrying case
Tool kit
Alkaline batteries
User manual
1-year manufacturer’s warranty


Specifications for the Northwest Instrument 5″ Digital Transit-Theodolite (5 Second Accuracy)

Image Erect
Magnification 30x
Diameter of Objective Lens (Aperture) 1.8 in (45 mm)
Focus Distance 3 ft (0.9 m)
Field of View 1 degree 20′ (2.3 ft at 100 ft)
Ratio of Stadia Lines 100
Resolving Power 4-inch
Optical Plummet
Magnification 3x
Field of View 5 degrees
Angle Measurement
Minimum Reading 5″
Unit of Reading/Measure 360º
Accuracy 5-second
Measuring Method/Reading System Photoelectric incremental encoder
Detection Method Single-vertical axis
Plate/Tubular Bubble Vial 30 seconds/2 mm
Circular Bubble Vial 8 minutes/2 mm
Weight 10 lbs (4.5 kg)
Warranty 1-year
Power Source RechargeableNiMH/alkaline batteries
Battery Life 80 hours
Battery Life Alert yes
90-Degree Layout yes
Checking Angles yes
Alignment and Plumb yes
Short-Range Leveling yes
General Construction yes
Anchor Bolt Positioning yes
Steel Column Placement yes
Setting Elevations yes
Setting Lines yes
Basic Grade Work yes
Display and Keypad
Type Graphic LCD display
Sides Dual
Backlight yes
Operating -4°F to +122°F (-20°C to +50°C )
Pin Port RS232C


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