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Topcon GM-50

Reflectorless Total Stations

• Fast and accurate new EDM ®
• Bluetooth communications (optional)
• Advanced angle accuracy
• Long battery life – 14 hours
• Rugged, waterproof design with IP66 rating
• 500 m long-range reflectorless measurement
• 50,000 point internal memory

  • Topcon GM-50
Essebaan 11
2908 LJ Capelle aan den IJssel
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Advanced Design for Faster Workflows

The GM-50 Series is the perfect entry-level site layout and survey tool offering reliability and flexibility without sacrificing cost or functionality.

The sleek design is built tough, with a water and dustproof IP66 rating, integrated Bluetooth® capability and an internal antenna, enabling you to deliver measurements cable-free to your data controller, streamlining your equipment weight and workflow.

The GM-50 is also armed with a top line EDM, generous internal memory storage, and SDRbasic on-board software so you have everything you need to get the job done out in the field.

  • Integrated Construction and Survey Application Software
  • Fast, accurate, and powerful EDM
  • Reflectorless up to 500m
  • Prism range up to 4,000 m
  • Advanced angle accuracy (2" or 5")

Topcon GM-50 Series total stations – advanced design with superior technology

The GM-50 Series was designed from the ground up to deliver the very latest technological advantages, all in a small, sleek design – you’ll appreciate the advantages from the very first measurement.

Featuring a class leading EDM unit, the GM-50 is able to measure up to 4,000 m at 1.5 mm + 2 ppm accuracy, to standard prisms, and can measure in reflectorless mode up to 500 m at an incredible 2 mm + 2 ppm accuracy.

Measurements are captured faster than ever, and with a beam width of 13 mm (at 30 m), the bright red laser dot pinpoints features with ease.

Versatile, Economical Solution

The GM-50 Series is smaller, lighter, with increased storage capacity. Offered at an even more cost-efficient option than previous models, it provides your customers the perfect tool for entry-level site layout and surveying. 

Bluetooth Communication ®

With integrated Bluetooth capability and internal antenna, the sleek design enables you to deliver measurements cable-free to your data controller.

Tested for toughness

We perform the tough environmental tests to ensure long-term operation even under the rough site environments. GM Series total stations are thoroughly inspected with dust-proof and water-proof test chambers. In addition, the various tests against vibration, drop, temperature, and humidity were successfully passed to achieve the best environmental spec. The measuring distance accuracy test on base line and the instrument leveling and angle accuracy test and adjustment by collimator system ensure your satisfaction on GM Series product quality.


  • Display Panel
    Graphic LCD, 192 x 80 dots, backlight : on/off (Selectable) / Alphanumeric keyboard / 28 keys with backlight
  • Area of Application
    GM-50 is perfect for: Land Surveying Topography & As-Built Construction Survey/Layout Layout & Survey Foundation and Exterior
  • Standard deviation [arcsec]
  • Compensation
    Collimation compensation- On/Off (selectable)
  • Prism EDM Range [m]
  • Prism EDM Accuracy [mm]
    1.5 mm + 2 ppm
  • Measuring Time [s]
    Fine: 0.9 sec Rapid: 0.6 sec Tracking: 0.4 sec
  • Non-Prism Range [m]
  • Non-Prism Accuracy [mm]
    2.0 mm + 2 ppm (0.2 - 200 m)
  • Max. operation time on one battery [hr]
  • Minimum working temperature [degC]
  • Maximum working temperature [degC]
  • IP dust/water protection class [IPxx]
  • Distinguishable features
    Ultra-powerful, advanced EDM.Easy access USB 2.0 memory. Advanced angle encoder system. Rugged, waterproof design.
  • Bluetooth
  • USB
  • RS232
  • Other connectors or connector specifications
    Bluetooth Class 1.5, Operating range: up to 10m. USB flash memory (max. 32GB). Serial RS-232C, USB2.0 (Type A for USB flash memory)

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