641662 Survey Peanut Prism Replacement for Leica GMP101 Mini Prism, Total Station Tilt Prism, +17.5mm Offset, Copper Coated This peanut prism replacement restores reliable aiming and distance measurement on Leica GMP101 miniprism systems. Its compact 'peanut' shape and precise +17.5 mm offset make it an effective, easytoinstall spare part for surveyors who need accurate, repeatable reflectors in the field. The copper coating improves durability and surface protection without changing the prism's optical performance. Key benefits Restores measurement capability quickly: direct replacement for Leica GMP101 mini prism when originals are lost or damaged. Preserves accuracy: the specified +17.5 mm offset keeps instrument geometry consistent and avoids systematic measurement error associated with incorrect offsets. Durable and fieldready: copper coating resists corrosion and handling wear, extending service life under normal surveying conditions. Compact and lightweight: peanut prism form factor is easy to carry and mount, minimizing interference when setting up or transporting. Key attributes Model: 641662 Type: Peanut (mini) prism replacement Compatibility: Designed as a replacement for Leica GMP101 mini prism used with Leica total station systems Offset: +17.5 mm (specified prism offset) Coating: Copper coated for surface protection and durability Functionality: Total station tilt prism for accurate reflectance and reliable distance/angle returns in routine surveying tasks Performance and usability This replacement peanut prism provides a stable, reflective target optimized for use with Leica total stations designed to accept the GMP101 mini prism. The +17.5 mm offset is critical for maintaining correct instrumenttarget geometry so field measurements continue to match expected survey tolerances. Installation is straightforward — the prism is intended as a direct swap for the Leica GMP101 mini prism, allowing quick changeouts on control points or targets in the field. Typical applications Boundary and cadastral surveys: use as a spare target to maintain continuous measurement operations when a primary prism is damaged or misplaced. Construction layout and stakeout: quick replacement on rods or mounts to minimize downtime during layout and alignment tasks. Topographic and site surveys: compact shape and robust coating make it suitable for repeated use on checkpoints and traverses. Compatibility and fit This item is supplied as the replacement peanut prism for Leica GMP101 mini prism assemblies and is intended for use with Leica total station setups that specify the GMP101. Model number 641662 identifies this specific replacement part with a +17.5 mm offset and coppercoated finish.