Seco 2159-01-BLK Prism Traverse Backsight Kit is a premium-grade surveying solution engineered for land surveyors, construction professionals, and geospatial engineers who require pinpoint precision in traversing and backsighting operations. Designed and manufactured by Seco, a leading name in the surveying equipment industry, this versatile and rugged kit delivers field-ready durability, outstanding optical accuracy, and enhanced usability, making it a top choice for professionals in the geospatial field.
Whether you’re setting control points, conducting high-precision traverses, or performing stakeouts, the Seco 2159-01-BLK offers everything you need in one comprehensive, easy-to-transport package.
Key Features of the Seco 2159-01-BLK Prism Traverse Backsight Kit
62-mm Silver-Coated Prism (#6400-10)
At the heart of the kit is a 62-mm high-performance prism, encased in a silver-coated canister, ensuring maximum reflectivity and minimal signal degradation even in challenging environments. The coating enhances performance under low-light or long-distance conditions.
Key Benefits:
- Superior signal return
- Long-range measurement support
- Resilient to weather and wear
Adjustable Tilt Target with Collimator
This backsight kit includes a reversible tilt target, fully adjustable to fit your field needs. With a built-in sighting collimator, users can achieve laser-sharp alignment for critical backsighting and layout tasks.
Offset Options:
| Offset Mode | Description |
| 0 mm | Ideal for zero-offset setups |
| -30 mm | Standard surveying configuration |
| -40 mm | Custom setups or specific needs |
360° Rotating Tribrach Adapter (#2153-10-BLK)
The rotating tribrach adapter provides smooth, accurate 360° horizontal rotation, enhancing usability during alignment and adjustments. Compatible with all prisms that use a 24.9 mm bayonet base, this adapter is engineered with tight machining tolerances to maintain alignment even during prolonged use.
Optical Plummet – Precision Vertical Alignment
The integrated 2.5x optical plummet features a twist-focus mechanism for effortless and sharp focusing on the ground point. This feature allows for highly accurate vertical centering over control points or markers.
Height and Accuracy Ratings
Designed for maximum performance, the Seco 2159-01-BLK offers:
- Height Range: 100 mm to 120 mm
- Accuracy: ±0.5 mm at 1.5 meters
This makes it suitable for precision-demanding tasks such as:
- Topographic surveys
- Construction site layouts
- Boundary and cadastral work
Tribrach (#2153-04-BLK) with Three-Screw Leveling
This kit includes a high-precision black-finished tribrach featuring:
- Three-screw leveling system
- 8-minute circular vial for quick setup
- Center line for reference alignment
- 5/8 x 11 threaded base for universal instrument compatibility
Hard Shell Case for Storage and Mobility
Every component of this kit fits snugly into the included hard shell case, which is:
- Shock-resistant
- Water-resistant
- Ergonomically designed for field portability
Total Weight: 9.95 lb (4.51 kg)
The balanced weight ensures stability on the field without being too heavy to carry, making it a perfect combination of portability and durability.
What’s Included in the Kit
Component | Model / Part Number |
| 62-mm Silver-Coated Prism | #6400-10 |
| Adjustable Tilt Target | Integrated |
| Rotating Tribrach Adapter | #2153-10-BLK |
| Optical Plummet | Integrated (2.5x Focus) |
| Adjustable Plate Vial (60 sec) | Integrated |
| Tribrach (Black Finish) | #2153-04-BLK |
| Hard Shell Carrying Case | Included |
Key Benefits at a Glance
Feature | Benefit |
| Precision-Machined Components | Long-lasting reliability and field stability |
| Modular System Design | Allows upgrades and replacements without full kit overhaul |
| Lightweight Yet Rugged Build | Field-ready portability without sacrificing durability |
| 360° Rotating Adapter | Facilitates quick angle adjustments and alignment |
| High-Visibility Targets | Improved targeting from longer distances |
| Collimator-Equipped Target | Increases aiming precision dramatically |
Frequently Asked Questions
What is the purpose of a prism traverse backsight kit?
A prism traverse backsight kit is used in surveying to establish reference directions by observing a backsight point from a known station. It helps in creating accurate traverse lines and control networks for mapping and construction projects.
Is the Seco 2159-01-BLK compatible with all total stations?
Yes, the kit includes a 5/8 x 11 threaded base tribrach, making it compatible with the vast majority of surveying tripods and total stations used in professional environments.
What is the benefit of a silver-coated prism?
Silver-coating increases the reflectivity of the prism, which enhances the strength and clarity of signals received by the total station — particularly valuable during long-range or low-light conditions.
Can I use this kit for robotic total station setups?
Absolutely. The high-accuracy prism and 360° rotating adapter make it an excellent choice for robotic and automated survey systems that demand precise backsighting.
What does “offset” mean in prism targeting?
Offset refers to the distance between the center of the prism and the reflective surface. This value is crucial for total stations to calculate correct distances. The kit supports 0, -30, and -40 mm offsets, ensuring compatibility with most survey systems.
How durable is the hard shell case included with the kit?
The case is engineered for rugged field conditions, resistant to impact, dust, and moisture. Its foam-padded interior ensures safe transport for sensitive optical components.
Does the kit require calibration?
The components are factory-calibrated, but regular field checks and re-leveling are recommended for sustained accuracy — especially after transportation or long-term use.
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