TOPCON GM105 Reflectorless Total Station

( Brand: Topcon ), ( Manufacturer Part Number: GM105 ), ( Model: TOPCON GM105 REFLECTORLESS ), ( Part Type: Station ), ( Unit Type: Unit ), ( Product: Total Station )

Review TOPCON Reflectorless Total Station

The **Topcon GM105 Reflectorless Total Station** is a cutting-edge surveying instrument designed to deliver unparalleled precision, efficiency, and versatility in both field and office applications. Engineered with Topcon s signature reliability and innovation, this compact yet powerful total station eliminates the need for traditional prisms while maintaining exceptional accuracy, making it an ideal choice for professionals in civil engineering, construction, geomatics, and land surveying. The GM105 integrates a high-performance **3-axis electronic compensator** with a **0.5 mg** angular resolution and ** 2 mm 2 ppm** linear accuracy, ensuring repeatable measurements even in challenging environments. Its **reflectorless technology** leverages advanced laser scanning and phase measurement techniques to detect and track targets without the need for reflective prisms, significantly reducing setup time and operational complexity. The built-in **LiDAR (Light Detection and Ranging) sensor** enhances its capabilities by enabling rapid distance measurements to both reflective and non-reflective surfaces, including vegetation, walls, and other obstacles, making it exceptionally well-suited for topographic surveys, volume calculations, and terrain modeling.

Equipped with a **large, high-resolution 5-inch touchscreen display**, the GM105 offers an intuitive user interface with customizable menus, real-time data visualization, and seamless integration with Topcon s **SiteLink** software suite. This allows surveyors to capture, process, and analyze field data on-site, streamlining workflows and minimizing errors. The device supports **wireless connectivity** via Bluetooth and Wi-Fi, enabling effortless data transfer to tablets, laptops, or cloud-based platforms for further analysis or reporting. Additionally, its **robust construction** with an IP54 rating for dust and water resistance ensures durability in harsh outdoor conditions, while the **ergonomic design** and lightweight build (approximately 3.5 kg) make it comfortable to carry over extended surveying sessions. The GM105 also features **automatic target recognition (ATR)**, which simplifies alignment and measurement processes by automatically detecting and tracking targets, reducing operator fatigue and improving productivity.

Beyond its core surveying functions, the GM105 excels in **automation and efficiency** through its compatibility with **Topcon s Smart Station** software, which enables automated data collection, real-time quality checks, and integration with BIM (Building Information Modeling) and GIS (Geographic Information Systems) platforms. Its **high-speed data transfer capabilities** (up to 100 measurements per second) and **low-power consumption** further enhance its appeal for large-scale projects where time and resource management are critical. Whether used for **as-built surveys, deformation monitoring, or infrastructure alignment**, the GM105 delivers a seamless blend of technology and precision, empowering surveyors to work smarter and achieve higher standards of accuracy in every project. With its future-proof design and continuous software updates, the Topcon GM105 stands as a cornerstone tool for modern surveying professionals seeking innovation without compromise.

The **Topcon GM105 Reflectorless Total Station** is a mid-range instrument designed for surveying tasks that require high accuracy without the need for prisms. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Topcon GM105**

1. **Reflectorless Operation**

The GM105 can measure distances and angles without a prism, which eliminates the need for additional equipment and speeds up fieldwork. This is particularly useful in environments where prisms are difficult to deploy, such as dense vegetation, urban areas, or when working with small targets like pipes or wires.

2. **High Accuracy**

The instrument offers sub-millimeter accuracy for distance measurements and high-precision angle readings, making it suitable for construction, civil engineering, and topographic surveys where precision is critical.

3. **Robust Build Quality**

Topcon is known for durable and weather-resistant instruments. The GM105 is built to withstand harsh conditions, including dust, moisture, and temperature fluctuations, which is essential for fieldwork in various climates.

4. **User-Friendly Interface**

The device features an intuitive touchscreen and user-friendly software, which simplifies data collection, processing, and reporting. The interface is designed to minimize training time for operators.

5. **Compatibility with Topcon Software**

The GM105 integrates seamlessly with Topcon s surveying software, such as **Topcon Tools** and **Survey Office**, allowing for efficient data transfer, processing, and visualization. This compatibility streamlines workflows and reduces the need for third-party software.

6. **Portability and Ergonomics**

The instrument is compact and lightweight, making it easier to carry and set up in the field compared to larger total stations. The ergonomic design reduces operator fatigue during prolonged use.

7. **Automatic Target Recognition (ATR)**

The ATR feature allows the GM105 to automatically detect and track small targets, such as pipes or wires, without the need for a prism. This is a significant advantage in utility surveys and infrastructure projects.

8. **Battery Life**

The instrument is equipped with a long-lasting battery, reducing downtime in the field. The ability to use rechargeable batteries also makes it more cost-effective in the long run.

9. **Support for Advanced Features**

The GM105 supports features like **3D scanning**, **point cloud generation**, and **automatic leveling**, which enhance productivity and accuracy in complex surveying tasks.

10. **Warranty and Customer Support**

Topcon offers comprehensive warranty coverage and reliable customer support, which is crucial for maintaining the instrument s performance and resolving any issues promptly.

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### **Cons of the Topcon GM105**

1. **Higher Initial Cost**

The GM105 is more expensive than basic total stations or even some prism-based models. The reflectorless capability and advanced features contribute to its higher price point, which may be a barrier for small surveying firms or individual users on a tight budget.

2. **Limited Reflectorless Range**

While the GM105 can measure distances without a prism, its reflectorless range is limited compared to prism-based total stations. In open areas with no obstructions, the range is sufficient, but in dense or reflective environments (e.g., water, glass, or highly reflective surfaces), accuracy may degrade, and measurements may become unreliable.

3. **Dependence on Line of Sight**

Like all total stations, the GM105 requires a clear line of sight to the target. Obstacles such as buildings, trees, or terrain can block the instrument s view, requiring additional setups or the use of alternative methods (e.g., robotic total stations or drones).

4. **Software Learning Curve**

While the interface is user-friendly, Topcon s software ecosystem can be complex, especially for users unfamiliar with surveying software. There may be a learning curve for new operators to fully utilize all features, which could slow down initial productivity.

5. **Maintenance Requirements**

The instrument requires regular calibration and maintenance to ensure accuracy. Dust, moisture, and physical stress can affect performance, and neglecting maintenance may lead to costly repairs or reduced lifespan.

6. **Limited Battery Life in Extreme Conditions**

While the battery life is generally good, extreme temperatures (either very hot or very cold) can reduce performance. Users in harsh climates may need to carry spare batteries or invest in additional power solutions.

7. **No Built-in GNSS Receiver**

The GM105 does not include a built-in GNSS (Global Navigation Satellite System) receiver, which means users must rely on external GNSS devices for RTK (Real-Time Kinematic) surveys. This adds complexity and cost if high-precision GNSS work is required.

8. **Weight and Portability Trade-off**

While the GM105 is lighter than some total stations, it is still heavier than handheld GNSS devices or basic surveying tools. For users who frequently move between sites, the weight may become cumbersome over time.

9. **Dependence on Topcon Ecosystem**

Users who rely heavily on Topcon s software and hardware may find it difficult to integrate the GM105 with non-Topcon tools or third-party software. This can limit flexibility in certain workflows.

10. **Resale Value**

Like many specialized surveying instruments, the GM105 may depreciate in value over time. While it remains a reliable tool, its resale market is niche, and the value may not recover fully if upgraded models are released.

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### **Conclusion**

The **Topcon GM105 Reflectorless Total Station** is a versatile and high-accuracy instrument that excels in reflectorless surveys, urban environments, and projects where speed and precision are prioritized. Its robust build, user-friendly interface, and compatibility with Topcon s software ecosystem make it a strong choice for professional surveyors, construction firms, and engineering teams. However, its higher cost, limited reflectorless range, and dependence on a clear line of sight may pose challenges for some users, particularly those working in complex or budget-constrained environments.

- **Civil engineering and construction projects** where reflectorless measurements are advantageous.

- **Topographic surveys** requiring high precision without prisms.

- **Utility surveys** involving small targets like pipes or cables.

- **Surveying firms** that already use Topcon s software and hardware ecosystem.

For users who primarily work with prisms or in open environments where reflectorless capabilities are less critical, a more affordable prism-based total station may be a better fit. Additionally, users who frequently require GNSS-based surveys may need to pair the GM105 with an external GNSS receiver, adding to the overall cost.

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### **Recommendation**

- You frequently conduct reflectorless surveys or work in environments where prisms are impractical.

- Your workflow relies on Topcon s software and hardware, and you value seamless integration.

- You prioritize accuracy, durability, and ease of use in your surveying tasks.

- Your budget allows for a mid-to-high-range total station, and you expect the investment to pay off through increased efficiency and reduced field time.

- Your projects primarily involve prism-based surveys, and you want to save on the higher cost of a reflectorless instrument.

- You frequently work in open areas where reflectorless limitations are not a concern.

- You require built-in GNSS capabilities and are open to instruments like the **Topcon GTS-250R** or **Leica Nova MS60**.

- You are a small firm or individual user with limited budget, and you may benefit from a more affordable entry-level total station.

In summary, the **Topcon GM105 is a well-rounded and reliable choice for professionals who need a reflectorless total station with advanced features and Topcon s ecosystem support**. For others, weighing the pros and cons against specific project needs will determine whether it is the right investment.

Details:

It presently sells new for $9,000. I have a Topcon GM105 Total Station for sale. Again, its in perfect condition. I paid $7,296 for it, and would sell it $5,000.

Included are 2 batteries and charger, as well the orange backpack pictured.

part #: gm105 prices

• $4500.00-$5393.69

specifications totalstationsurveyzo:

• brand: Topcon
• mpn: Gm105
• model: Topcon Gm105 Reflectorless
• part type: Station
• unit type: Unit
• product: Total Station

seller totalstationsurveyzo:

• city: Athens, Ohio
• # reviews: 0
• rating: 0.0%

offer totalstationsurveyzo:

• availability: In Stock
• sold: 0
• options: Seller-arranged-local-pickup
• quantity: 1
• started: May 5, 2026
• best offers: True

general totalstationsurveyzo:

• Test, Measurement Inspection > Levels Surveying Equipment > Total Stations Accessories
• condition: Used

payments totalstationsurveyzo:

• wallet: Paypal
• other
• credit card: Visa

shipping totalstationsurveyzo:

returns totalstationsurveyzo:

• policy: No Returns

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