GPT-3002 GPT-3003 GPT-3005 GPT-3007

Best Performance Non-prism Measurement

The Topcon GPT-3000 series are Pulse Laser Total Stations with a superior non-prism measurement capability. Making use of an updated optical system, the GPT-3000 Series incorporates special techniques to provide accurate, reliable and safe non-prism distance measurement over a range of upto 250 meters. In addition to non prism measurement, the GPT-3000 series is of a compact, robust construction with IP66 water and dust protection making it the ideal construction site surveying instrument. The easy to use software provides complete functionallity to carry out all surveying and stake out routines and calculations and to store all data in the instrument itself. For a complete, All weather, Non-Prism surveying instrument that can be applied to almost any surveying task, look no further than the Topcon GPT-3000 Series.


Visible Laser Pointer

GPT-3000 Series uses both an invisible Pulse Laser Diode for distance measurement and a Visible Red Laser Beam as a laser pointer to identify the measurement point at the center of the cross-hairs of the telescope. The visible laser pointer is a Class 2 laser which can be easily switched on and off as required. The laser pointer is an effective help in 1) identifying the measurement point during non prism measurement and for 2) targeting the required point during stake-out.

Toughest Durability

The proven robustness and durability of Topcon construction Total Stations is also to be found in the GPT-3000 Series. With International protection standard IP66, the instruments are water and dust proof and ensure reliable performance even in the harshest site conditions. This increases the amount of work hours in a day by allowing work to continue even in bad weather and also ensures that the instrument will perform reliably for many years without the need for lengthy service and repairs.

Simple Operation 

The GPT-3000 series is based on the best selling Total Station GTS-220 Series and has the same powerful yet extremely easy to use surveying and stake-out software.

 Large Internal Memory

The GPT-3000 Series has the internal memory to store up to 8,000 points for data collection, or up to 16,000 points for layout work.

 Dual-Axis Compensator

A dual-axis compensator is included in the GPT-3002/3003/3005 models. This dual-axis tilt sensor automatically corrects the vertical and horizontal angle compensation for leveling error, ensuring accurate and reliable angle readings.

Point Guide System 

Topcon’s Point Guide function is available as standard on the GPT-3000 Series. Get on line quickly and easily with this feature. Two (2) LED lights, one flashing and one constant, help identify the correct direction for setting out.

Non-Prism Measurement Features

Long Range measurement

The GPT-3000 Series can measure over a range of upto 250m in Non-Prism mode. This capability ensures a high performance non-prism measurement at ranges of between 50 and 150 meters by making measurement possible to the dark, rough or inclined surfaces which are encountered in the practical site environment. Non-prism measurements are rarely required to be made to perpendicular, Kodak Grey surfaces on which most instrument measurement specifications are based. Topcon GPT-3000 is designed to perform under real site conditions.

Safe Measurement

Topcon’s unique Pulse Laser technology with narrow beam optical system is a Class 1 laser. This allows the instrument to be used in compliance with safty regulations on the construction site or in crowded public areas. A Class 1 laser is permitted in these environments being safe for the user and passer-by.

Dual Optical System

The GPT-3000 has a dual optical system for laser distance measurement. Non-prism measurement is made with a narrow beam system providing a stable invisible narrow beam, which produces a stable measuring spot for nonprism measurements. This allows accurate measurements at longer distances but also improves the ability to measure to difficult surfaces, such as asphalt, at shorter distances.

The Topcon system produces a high quality measuring spot which ensures that the point you are pointing at is the point you are measuring. The second optical system in the GPT-3000 series is used for making measurements using a reflecting glass prism (as with traditional EDM). This system has a broader measurement beam and is very stable over long distances upto 3 Km. The high stability of the beam ensures excellent performance even in conditions with high heat shimmer or other circumstances where the air is unstable, such as over water or along side buildings.

Switching between the 2 optical systems is achieved by a simple, one key touch operation.

Pulse Laser technology

The special Pulse Laser technology in the GPT-3000 Series uses the priciple of "Time of Flight" to measure the time taken for a pulsed burst of laser energy to travel to a surface and back to the instrument. The technique used by Topcon has the ability to identify the reflection from the targetted point, thus filtering out the unnecessary signals from surfaces in front of, or behind the point to be measured. The GPT-3000 can recognise the target at the center of the telescope cross-hairs and ensure that measurement is made to the required surface. Using this technology even non-prism measurements through a chain-link fence or to corner points can be made.

Application Software

Non-Prism Plane Offset Program

Topcon's exclusive, "Plane Offset Program" is standard on all GPT products. Just measure three (3) random points on a wall or plane to establish a known plane. Then sight the unknown point on the plane and the GPT calculates coordinates and distance values of the desired point.

Remote Elevation Measurement (REM) 

This feature measures the height where a prism can not be placed directly. Measurement can be extended along the plumb line as the height is continuously displayed



The features and software of the GPT-3000 Series combine to provide ultimate flexibility in many field applications such as City Elevation Work, Forestry Survey, Quarry Surveys, Mining surveys, Accident Investigation.

Z coordinate of occupied point (Benchmark Elevation)

Z coordinate and direction angle of the instrument can be calculated and reset by measuring Z coordinate of known points (Max. 10 points).

Area calculation

Area can be calculated using measured data or file data (Coordinate data).

Missing Line Measurement (MLM)

Multiple lines can be drawn between;
1. the first point and the last point.
2. the last 2 points.

Horizontal distance, difference in height and slope distance are calculated. Coordinate file data and manual input data are available to be used.

Point to line measurement

Create a new coordinate by measuring to two points. The 1st point becomes the origin and the 2nd point becomes the N axis direction.