Topcon GT-702 Robotic Total Station

Survey-Grade Accuracy on the Value GT-700 Platform

The GT-702 is the highest-accuracy model in the Topcon GT-700 series. Two-second angular accuracy delivers survey-grade precision for boundary work, tight-tolerance layout, and construction verification, on the same rugged IP65 platform used across the rest of the GT line. Paired with 120-degree-per-second Brushless Direct Current motors and 4,500-meter prism range, the GT-702 is the right instrument for contractors and field crews who need tighter tolerances than the GT-703 or GT-705 without stepping up to the GT-1500 price point.

Key Features

• Brushless Direct Current Motors: 120-degree-per-second rotation and 18-degree-per-second auto tracking from intelligent BLDC motors. Smoother, quieter, and longer-lasting than traditional servo or ultrasonic designs.
• 2-Second Angular Accuracy: The highest accuracy in the GT-700 series. Covers boundary surveys, high-precision construction layout, structural steel verification, and control work.
• UltraTrac Prism Tracking: Advanced optical sensing and high-speed BLDC motor control maintain rock-solid prism lock at ranges up to 800 meters, even on busy jobsites.
• Hybrid Positioning Ready: Seamlessly combine robotics with GNSS for continuous data capture. Work under tree cover or when line of sight breaks down, without changing software.
• Compact and Lightweight: Rugged, trimmed-down design that is 30 percent smaller and lighter than previous-generation Topcon robotic models. Weighs only 5.9 kg with battery.
• Rapid 10 Hz EDM: Accelerated update rate for fluid guidance and higher daily point counts during layout and staking.
• RC-5A Remote Compatibility: Reacquire your prism in seconds with single-tap acquisition from up to 300 meters away.
• LongLink Bluetooth: 600-meter communication range with RC-5A in open conditions.
• Rugged IP65 Rating: Fully dust- and waterproof construction. Operates in temperatures from -20°C to 50°C.

Why Choose the GT-702 Over the GT-1502

Both the GT-702 and the GT-1502 have 2-second angular accuracy. They differ on the platform underneath. The GT-1502 runs 200-degree-per-second motors with 5,000-meter prism range and 1 mm fine distance accuracy. The GT-702 runs 120-degree-per-second motors with 4,500-meter prism range and 2 mm fine distance accuracy. If your work rarely exceeds 4,500 meters, if setup speed is not your bottleneck, and if 2 mm distance accuracy is sufficient for your deliverable, the GT-702 gives you the same angular accuracy class at a meaningfully lower cost. Most trade contractors and small survey firms fit that description.

Technical Specifications

• Angular Accuracy: 2" (0.0006 gon / 0.010 mil)
• Angle Display: 0.5" / 1" selectable
• Prism Range: 1.3 to 4,500 m (14,760 ft)
• Reflectorless Range: 0.3 to 800 m (2,624 ft)
• Distance Accuracy (Fine): 2 mm + 2 ppm
• Measuring Time: Fine 0.9s / Rapid 0.6s / Tracking 0.4s
• Max Rotation Speed: 120°/sec
• Max Auto Tracking Speed: 18°/sec
• UltraTrac Tracking Range: 1.3 to 800 m
• Motor Type: Brushless Direct Current (BLDC)
• Operating System: Windows Embedded Compact 7
• Display: 4.3" TFT VWGA color touchscreen
• Communications: Bluetooth Class 1 (600 m with RC-5A), USB 2.0, RS-232C
• Battery Life: Approximately 4 hours per BDC72 battery
• Environmental: IP65 dust and water resistant, -20°C to 50°C operating temperature
• Weight: 5.9 kg (normal handle) / 6.0 kg (RC handle)

Standard Kit Includes:

• GT-702 Total Station
• 2x BDC72 Rechargeable Li-ion Batteries
• CDC77 Dual Battery Charger
• Rugged Hard Carrying Case
• Lens Cap and Tool Kit
• Calibration Certificate

Industry-Leading Warranty:

• 3-Year Instrument Warranty
• 5-Year UltraSonic Motor Warranty

Common Questions About the GT-702

What is the angular accuracy of the Topcon GT-702?
The GT-702 has 2-second (2") angular accuracy, the highest in the GT-700 series. At 100 feet, that translates to less than 1/16 inch of horizontal offset, suitable for boundary surveys, high-precision construction layout, and structural steel verification.

What is the difference between the GT-702 and the GT-703?
The GT-702 has 2-second angular accuracy and the GT-703 has 3-second. Both use the same GT-700 platform (120°/sec motors, 4,500 m prism range, 2 mm fine distance accuracy). Choose the GT-702 for boundary work, high-precision layout, and any application where 2-second accuracy is required. Choose the GT-703 for mainstream construction layout at a lower price point.

What is the difference between the GT-702 and the GT-1502?
Both have 2-second angular accuracy. The GT-1502 uses the faster GT-1500 platform (200°/sec motors, 5,000 m prism range, 1 mm fine distance accuracy). The GT-702 uses the GT-700 platform (120°/sec, 4,500 m, 2 mm). Choose the GT-702 when you want the same angular accuracy class at a more accessible price point and do not need the extra range or speed of the GT-1500.

Is the GT-702 compatible with Hybrid Positioning?
Yes. The GT-702 pairs with any Topcon GNSS receiver to create a Hybrid Positioning system. Switch between robotic total station and GNSS measurement within the same field software, with no workflow change.