Topcon GT-1501 Robotic Total Station

Survey-Grade Precision at the Top of the GT Line

The GT-1501 is engineered for professionals who cannot afford to trade accuracy for anything. One-second angular accuracy makes it the tightest-tolerance instrument in the Topcon GT series, designed for high-order control surveys, construction monitoring, and deformation work where the margin for error is measured in hundredths of an inch at distance. Paired with 200-degree-per-second BLDC motors, 5,000-meter prism range, and Hybrid Positioning compatibility, the GT-1501 delivers survey-grade accuracy without compromising jobsite speed.

Key Features

• Brushless Direct Current Motors: 200-degree-per-second rotation and 20-degree-per-second auto tracking from intelligent BLDC motors. Smoother, quieter, and longer-lasting than traditional servo or ultrasonic designs.
• Industry-Leading 1-Second Accuracy: The highest angular accuracy in the GT series. Ideal for control networks, precision monitoring, and any project with unforgiving tolerances.
• UltraTrac Prism Tracking: Rock-solid prism lock at ranges up to 1,000 meters, even in high-vibration environments and busy jobsites.
• 5,000-Meter Prism Range: Extended range for long-shot survey work and large-site control networks.
• 1,000-Meter Reflectorless: Measure difficult targets without placing a prism. Ideal for as-built verification, facade documentation, and hard-to-reach surfaces.
• Hybrid Positioning Ready: Pair with a Topcon GNSS receiver for seamless switching between robotic and GNSS measurement without changing software or workflows.
• 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, no obstacles, no rain.
• Rugged IP65 Rating: Fully dust- and waterproof construction. Operates in temperatures from -20°C to 50°C

When Accuracy Cannot Be Negotiated

Licensed surveyors, monitoring engineers, and high-order control crews rely on 1-second accuracy for a reason. At 100 feet, one second of angular error translates to less than 1/256 inch of horizontal offset. At 1,000 feet it stays under 1/16 inch. That is the margin that separates survey-grade work from construction-grade. The GT-1501 gives you that margin, delivered on the same fast, rugged platform as every other GT-1500 model. Compatible with Topcon Field, Digital Layout, or Pocket3D.

Technical Specifications

• Angular Accuracy: 1" (0.0003 gon / 0.005 mil)
• Angle Display: 0.5" / 1" selectable
• Prism Range: 1.3 to 5,000 m (16,400 ft)
• Reflectorless Range: 0.3 to 1,000 m (3,280 ft)
• Distance Accuracy (Fine): 1 mm + 2 ppm
• Measuring Time: Fine 0.9s / Rapid 0.6s / Tracking 0.4s
• Max Rotation Speed: 200°/sec
• Max Auto Tracking Speed: 20°/sec
• UltraTrac Tracking Range: 1.3 to 1,000 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-1501 Total Station
• 2x BDC72 rechargeable lithium-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-1501

What is the angular accuracy of the Topcon GT-1501?
The GT-1501 has 1-second (1") angular accuracy, the highest in the Topcon GT series. At 100 feet, that translates to less than 1/16 inch of horizontal offset, suitable for high-order control surveys, monitoring projects, and precision layout.

What is the prism range of the GT-1501?
The GT-1501 measures to a single prism from 1.3 to 5,000 meters (16,400 feet) and to a reflectorless target from 0.3 to 1,000 meters (3,280 feet).

Is the GT-1501 compatible with Hybrid Positioning?
Yes. The GT-1501 pairs with any Topcon GNSS receiver to create a Hybrid Positioning system. You can switch between robotic total station and GNSS measurement within the same field software, with no workflow change.

What is the difference between the GT-1501 and GT-1502?
Both use the same GT-1500 platform (200°/sec motors, 5,000 m prism range, 1 mm distance accuracy). The only difference is angular accuracy. The GT-1501 is 1-second, the GT-1502 is 2-second. Choose the 1501 when tolerances are survey-grade or tighter.