GPR112+GDZ112+GHT112 Monitoring Prism Set delivers on all fronts, offering a comprehensive, high-precision solution for both temporary and long-term outdoor monitoring applications. With a 60mm silver-coated high-accuracy prism, UV-stabilised heavy-duty plastic housing, and an integrated rain shield and anodised aluminium bracket, this set is engineered to withstand the harshest field conditions while maintaining precise measurement standards.
Whether you’re engaged in structural monitoring, geodetic surveys, construction layout, or mining surveys, this monitoring prism set enhances your total station’s capabilities, ensuring maximum efficiency and reliability.
What’s Included in the GPR112+GDZ112+GHT112 Set?
Component | Description |
| GPR112 Prism | 60mm silver-coated precision prism with 0 mm prism constant |
| GDZ112 Holder | Aluminium bracket with integrated rain shield |
| GHT112 Adapter | Adapters for both 5/8″ and M8 mounting threads |
Key Features and Specifications
Feature | Specification |
| Prism Diameter | 60mm |
| Prism Coating | Silver-coated for high reflectivity |
| Accuracy | 3″ (seconds of arc) |
| Prism Constant | 0 mm |
| Maximum Range | Up to 2,500 meters with total stations |
| Casing | UV-stabilised, heavy-duty plastic |
| Bracket | Anodised aluminium with rain shield |
| Mounting Threads | 5/8″ and M8 included |
| Filter | Built-in to reduce condensation inside prism |
| Application | Long-term outdoor and geodetic monitoring |
Frequently Asked Questions
What is the purpose of a monitoring prism in total station surveying?
A monitoring prism reflects the electronic distance measurement (EDM) signal from the total station. It’s used to determine precise locations over time, especially useful for structural monitoring, deformation tracking, and long-term surveying projects.
What does the “0 mm prism constant” mean?
The prism constant is the difference between the prism center and the center of the EDM measurement. A 0 mm constant means no correction is needed, simplifying configuration with your total station.
Can I use this prism set with all brands of total stations?
Yes, the GPR112 prism is compatible with most major total station brands, including Leica, Trimble, Topcon, Sokkia, and others, especially when equipped with universal 5/8″ or M8 mounts.
Is this prism set suitable for permanent installations?
Absolutely. With its UV-stabilised casing, weatherproof design, and corrosion-resistant bracket, it’s tailored for long-term, unattended outdoor use in challenging environments.
How do I prevent fogging or condensation inside the prism?
The built-in anti-condensation filter helps regulate internal moisture, greatly reducing fogging even in highly humid or rainy environments.
Does it come assembled or do I need to put the parts together?
The set comes semi-assembled. Minimal setup is required—mounting the prism into the holder and attaching the bracket using the desired adapter thread (5/8″ or M8).
Can I use this for both monitoring and standard layout work?
Yes. While optimized for monitoring applications, the GPR112+GDZ112+GHT112 prism set can also be used for general layout, stakeout, and control point establishment.
What maintenance is required for the prism?
Basic maintenance includes cleaning the prism surface with a soft, lint-free cloth and ensuring no moisture accumulates inside. The UV-protected housing and anodised bracket require minimal upkeep.
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