April 23, 2018 In Coventional Construction

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 reflectors measurement
  • 50,000 points internal memory

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

       gm-50The 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 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 performed the tough environmental tests to ensure long-term operation even under the rough site environments. GM Series total stations are throughly 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 levelling and angle accuracy test and adjustment by collimator system ensure your satisfaction on GM Series product quality.




Magnification/Resolving power


Others Length : 171mm (6.7in.), Objective aperture : 45mm (1.8in.)(48mm(1.9in.)for EDM), Image:Erect, Field of view :1°30′(26m/1,000m), Minimum focus:1.3m (4.3ft.) Reticle illumination : 5 brightness levels
Angle measurement
Minimum Display 1″/5″ (0.0002/0.001gon, 0.005/0.02mil)
Accuracy (ISO 17123-3:2001)



Dual-axis compensator/ Dual-axis liquid tilt sensor, working range : ±6′
Collimation compensation On/Off (selectable)
Distance measurement
Laser output Reflectorless mode : Class 3R/Prism/sheet mode : Class 1
Measuring Range
Reflectorless 0.3 to 500m (1,640ft.)
Reflective sheet RS90N-K : 1.3 to 500m (4.3 to 1,640ft.),
RS50N-K : 1.3 to 300m (4.3 to 980ft.),
RS10N-K : 1.3 to 100m (4.3 to 320ft.)
Mini prism 1.3 to 500m (4.3 to 1,640ft.)
One prism 1.3 to 4,000m (4.3 to 13,320ft.)
Minimum Display Fine/Rapid : 0.0001m (0.001ft./1/8 in.)/0.001m(0.005ft./1/8 in.)(selectable) Coarse : 0.001 (0.005ft./1/8 in.)/0.01m (0.02ft./1 in.) (selectable) Tracking/Road : 0.01m (0.02ft./1 in.)
Accuracy (ISO 17123-4:2001) (D=measuring distance in mm)


Reflectorless (2+2ppmxD) mm
Reflective sheet (2+2ppmxD) mm
Prism (1.5+2ppmxD) mm
Measuring Time
Fine 0.9s (initial 1.5s)
Rapid 0.6s (initial 1.3s)
Tracking 0.4s (initial 1.3s)
OS, Interface and Data Management
Operating system


Display/Keyboard Graphic LCD, 192×80 dots, backlight : on/off (Selectable)/Alphanumeric keyboard/28 keys with backlight
Control panel location

On both faces

On single face

Data storage  (Internal memory) Approx. 50,000 points
Plug-in memory device USB flash memory (max. 32GB)
Interface Serial RS-232C, USB2.0 (Type A for USB flash memory)
Bluetooth modem (option) Bluetooth Class 1.5, Operating range : up to 10 m
Laser -pointer Coaxial red laser using EDM beam
Levels Graphic 6′ (Inner Circle)
Circular level (on tribrach) 10′/2mm
Plummet Optical Magnification : 3x, Minimum focus : 0.5m (19.7in.) from tribrach bottom
Laser (option) Red laser diode (635nm±10nm),
Beam accuracy : <=1.0mm@1.3m, Class 2 laser product
Dust and water protection/Operating temperature

IP66 (IEC 60529:2001)/-20 to +60°C (-4 to +140°F)

Weight with battery & tribrach

Approx. 5.1 kg (11.3lb)

Power supply

Li-ion rechargeable battery BDC46C

Operating time (20°C)

Approx.14 hours

Application program
On board *REM Measurement   *3D Coordinate Measurement   *Resection   *Stake Out   *Topography Observation  *Offset Measurement   *Missing Line Measurement   *Surface Area Calculation   *Route Surveying   *Point to Line


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