Leica GMP101 Mini Prism Set The Leica GMP101 Mini Prism Set is a precision mini prism kit designed for surveying and layout applications, providing accurate centring, portable operation, and reliable field durability . The prism is mounted in a durable metal holder and includes essential accessories for complete field deployment. Key Features • Mini prism mounted in durable metal holder • Includes circular bubble, spike, removable target plate, and padded bag • Prism constant of +17.5 mm • Centring accuracy of 1.0 mm • Measurement range up to 2,000 m (6,600 ft)