GMP104 L Bar Double Side Monitoring Prism 25.4mm 90 Degree

The GMP104 L Bar Double Side Monitoring Prism is a precision surveying reflector designed for deformation monitoring and control networks. Featuring a 25.4mm diameter prism with double‑side reflective surfaces, this L‑bar prism provides 90‑degree coverage, allowing measurements from two orthogonal directions without repositioning. The compact size and robust construction make it ideal for tunnel monitoring, bridge deflection surveys, and structural health monitoring.

The GMP104 L Bar Double Side Monitoring Prism is manufactured from high‑quality optical glass with a durable metal housing. The double‑side design ensures a strong return signal from both faces, eliminating the need to rotate the prism when changing measurement angles. The L‑bar bracket includes standard 5/8‑11 threaded mounting points for secure attachment to monitoring anchors, poles, or tribrachs. The prism constant is 0mm, simplifying data reduction.

The GMP104 L Bar Double Side Monitoring Prism is compatible with most total stations and laser scanners. Its 25.4mm prism diameter offers excellent reflectivity for long‑range monitoring, while the double‑side feature saves time during repeated measurements. The prism housing is weather‑resistant and includes a protective cover to keep optics clean when not in use. Each unit is factory‑calibrated for consistent performance.

Ideal for geotechnical engineers, surveyors, and infrastructure inspectors, this monitoring prism ensures reliable, repeatable data over extended periods. Whether you are tracking slope movement, dam deformation, or building settlement, the GMP104 L Bar Double Side Monitoring Prism delivers accurate results. Upgrade your monitoring toolkit with this durable, double‑side L‑bar prism for efficient 90‑degree coverage.