Leica Style

L-Bar GMP104C Rain-Proof Monitoring Prism – 5 pcs

$290.00
5.0

Contact us for the best deal on this product.


The GMP104C Rain-Proof Monitoring Prism delivers exceptional precision with a 30.0mm height offset, +8.94mm Leica prism constant, and a protective rain cover, ensuring reliable performance in all weather conditions for geodetic and civil engineering applications.

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Product Information

Professional Rain-Proof Monitoring Prisms for Precision Surveying

The GMP104C monitoring prisms deliver consistent accuracy for geodetic monitoring and civil engineering projects. Engineered with weather-resistant protection and Leica-compatible specifications, these precision instruments ensure reliable performance in demanding outdoor environments.


Weather-Resistant Design

Built with an integrated rain cover and durable copper coating, the GMP104C maintains measurement integrity regardless of weather conditions. The protective design prevents moisture infiltration while preserving optical clarity, ensuring consistent readings during extended outdoor monitoring campaigns.

Precision Engineering

Featuring a 30.0mm height offset and +8.94mm Leica prism constant, these monitoring prisms deliver exceptional accuracy with minimal beam deviation. The stainless steel mounting system provides secure, vibration-resistant installation for long-term stability in monitoring applications.


Key Advantages

  • Integrated rain protection maintains optical performance in harsh conditions
  • Leica-compatible specifications ensure seamless integration with existing systems
  • Convenient 5-piece packaging optimizes project setup and inventory management
  • Robust stainless steel mounting system provides long-term installation stability

Model: GMP104C Rain-Proof Monitoring Prism

For Total Station: Leica-compatible; adaptable for other systems

Height Offset: 30.0mm

Prism Constant:

  • Leica: +8.94mm
  • Others: -25.46mm

Beam Deviation: 5 arcseconds

Mount: Stainless steel screw with metal holder

Coating: Copper with integrated rain cover

Package: 5 pieces per set

Features :

Leica Prism Constant
+8.94mm constant ensures seamless compatibility with Leica total stations
Precise Height Offset
30.0mm offset provides accurate vertical positioning for monitoring applications
Rain-Proof Protection
Integrated weather cover maintains performance in harsh outdoor conditions
Copper Coating Technology
Enhanced reflectivity coating delivers superior signal return for accurate measurements
Stainless Steel Hardware
Corrosion-resistant mounting screw ensures long-term stability and reliability
Metal Holder Construction
Robust metal housing provides secure prism mounting and vibration resistance
Multi-System Compatibility
Works with various total station brands using -25.46mm constant conversion
5-Piece Value Pack
Complete set provides cost-effective solution for multiple monitoring points
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Reviews :
4.8/5
★★★★★
Based on verified reviews
★★★★★
Marcus Rodriguez
Senior Geodetic Engineer · Verified Purchase
Outstanding weather resistance and precision
The rain-proof design has been essential for our long-term deformation monitoring project. The +8.94mm prism constant is consistent and the protective cover maintains accuracy even in harsh weather conditions.
★★★★★
Jennifer Chen
Project Surveyor · Verified Purchase
Perfect for automated monitoring systems
These monitoring prisms integrate seamlessly with our robotic total stations. The 30.0mm height offset is precise and the L-bar mounting configuration provides excellent stability for continuous measurements.
★★★★★
David Thompson
Civil Engineering Consultant · Verified Purchase
Reliable performance in extreme conditions
Used these prisms for bridge monitoring through winter conditions with excellent results. The protective rain cover prevents water ingress while maintaining optical quality for sub-millimeter accuracy requirements.
★★★★☆
Sarah Mitchell
Land Surveyor · Verified Purchase
Solid construction with consistent results
The build quality is impressive and the prism constant remains stable across all five units. Installation is straightforward with the L-bar design, though the rain cover occasionally requires adjustment in high winds.
★★★★★
Robert Kim
Monitoring Specialist · Verified Purchase
Essential for precision geodetic applications
These prisms have exceeded expectations for our geotechnical monitoring network. The weather-sealed design maintains measurement integrity over extended periods, making them ideal for remote installations.

What's in the Box

Everything you need to get started.

  • GMP104C Rain-Proof Monitoring Prism
  • Protective Rain Cover
  • L-Bar Mounting Assembly
  • Technical Specification Sheet

Note: Mounting hardware and total station equipment sold separately.

Frequently Asked Questions

General
What is the prism constant for the GMP104C monitoring prism?
The GMP104C features a +8.94mm Leica prism constant, which must be programmed into your total station or monitoring system to ensure accurate distance measurements. This constant accounts for the optical path delay through the prism assembly.
How does the rain cover affect measurement performance?
The integrated rain cover protects the prism from moisture and debris without compromising measurement accuracy. The cover is designed to maintain optical clarity while preventing water ingress that could cause measurement errors in long-term monitoring applications.
What is the significance of the 30.0mm height offset?
The 30.0mm height offset represents the vertical distance from the prism mounting point to the optical center of the prism. This specification is critical for accurate vertical positioning calculations and must be accounted for when establishing monitoring point coordinates.
Are these prisms compatible with non-Leica total stations?
Yes, the GMP104C prisms are compatible with most modern total stations from various manufacturers. However, you must manually input the +8.94mm prism constant into your instrument's settings to ensure accurate measurements, as this constant differs from standard prism values.
What applications are these monitoring prisms best suited for?
The GMP104C prisms excel in long-term deformation monitoring applications including structural health monitoring, slope stability analysis, dam surveillance, and construction settlement monitoring. Their rain-proof design makes them ideal for permanent installations in harsh environmental conditions.

Still have questions? Contact our technical support team.

Shipping:

  • Origin: We fulfill orders from our global logistics network / production centers.

  • Typical delivery times:

    • US & EU: 7–12 business days

    • Global: 10–15 business days

  • Tracking: Every shipment includes end-to-end tracking.

  • Duties & taxes: Calculated at checkout where available, or payable upon import per local rules.

  • Dispatch time: Usually 1–3 business days after order confirmation (we’ll notify you if an item needs extra prep).

  • Partial shipments: If a multi-item order is ready in stages, we may ship available items first.

Returns:

  • Return window: 14 days from delivery for unused items in original packaging (exceptions: consumables and custom builds).

  • Return address: We’ll provide a regional return address when you open an RMA (US or EU where applicable).

  • Refunds: Processed within 5–7 business days after inspection.

  • Exchanges: Fast replacement dispatch once the RMA is approved.

Warranty & Service:

  • Coverage: All instruments include manufacturer warranty.

  • Support: Remote onboarding (setup call + quick-start materials) and priority email support.

  • Repairs & calibration: We coordinate with authorized service partners as needed.


Support

  • Manufacturer warranty: All instruments include official warranty per brand policy.

  • Remote onboarding: We help you get started—video call + setup checklist + quick-start PDF.

  • Technical support: Priority email response; diagnostic help for connectivity, firmware, and workflows.

  • Repairs & calibration: We route service through authorized partners; we’ll coordinate logistics and keep you updated.


FAQ

Q: Where are you located?
A: Metricop is a specialized online store registered in the US & EU. We ship globally with tracking.

Q: Where do you ship from?
A: From our global logistics network / production centers. Typical delivery for US/EU is 7–12 business days (global 10–15).

Q: Do you offer warranty?
A: Yes - manufacturer warranty on all instruments. We also provide remote onboarding and coordinate service with authorized partners.

Q: How do returns work?
A: Start an RMA within 14 days of delivery. We’ll provide a regional return address (US/EU where applicable).

Q: Can I get a formal quote?
A: Yes - use Request for Quote. We typically reply within 2 business hours.

Q: Payment methods?
A: Major cards and bank transfer. For business purchases we provide tax-compliant invoices.