Circular Prism (5",silver-coated)

Model: GPR121-RED4-5S-AG
Product Overview
The GPR112-RED4-5S is a high-precision surveying prism built for routine field conditions. It delivers
≤5″optical accuracy, 2000 m range, and combines non-waterproof, silver-coated with high visibility.
Durable PC canister, K9 glass and dual-thread mounting ensure broad compatibility with surveying
instruments (theodolites, total stations, etc.)

1.Optical Accuracy
1)Prism Accuracy
≤5″ arc-seconds, verified by a real-time Zygo interferometer test report included with each unit.
This ensures superior angle measurement reliability.

2)Glass Material
Precision-ground optical K9 glass, providing excellent light transmission and minimal distortion.

3)Measuring Range
Up to 2000 m under normal weather conditions, supporting long-distance operations.

4)Prism Offset
Fixed at either 0 mm or 30 mm, determined by the assembly configuration of the two-part housing,
allowing flexible setup for Sokkia-compatible applications and other surveying instruments such as
theodolites and total stations.

2.Physical Specifications
1)Prism Aperture
62 mm (2.44 in), offering a large effective reflective area for robust signal return.

2)Housing Material
High-grade Polycarbonate (PC), engineered for color-fastness and heat resistance, ensuring structural
integrity and long-term appearance under solar exposure.

3)Housing Color
Solid orange-red housing provides high visibility against low-contrast backgrounds, reducing the risk
of prism loss and improving survey crew efficiency.

3.Environmental Durability
1)Silver-coated (AG)
Silver coating provides a larger acceptance angle and higher reflectance,enabling easier alignment and
reliable signal return in surveying applications.

2)Accessories
Includes a white dust-proof cover (optional) and a desiccant agent for additional protection during
storage and transport.

4.Mounting Compatibility
1)M20 male Stainless Steel (SS) Thread
Compatible with most standard prism holders, specifically the GHT112 series with M20 thread, and
Geomaster sets (GHT112-20/ALU or GHT112-20/BLK).

2)Universal Compatibility
Fully interoperable with top-brand surveying instruments, ensuring seamless field integration.
Note: Any updates would be subject to change without prior notice.
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