Features Clear Reflection: Designed to have ‑17mm constant and 25.4mm effective diameter, the mini surveying prism ensures clear image in reflection. Enhanced Accuracy: Crafted with exceptional workmanship, this optical glass prism boasts high accuracy, significantly enhancing measurement accuracy Robust Durability: Encased in a durable ABS plastic housing, the lens is well-protected against wear and tear, promising longevity and resilience for extended usage. Versatile Application: Compatible with Trimble and other surveying instruments, this prism is versatile enough for a wide range of applications, including tunnel, metro, and mine evaluations Simplified Setup: Featuring a clear internal thread in the brass adapter, the prism effortlessly attaches to any 5/8-inch x 11 threaded rod or tripod, facilitating quick and easy installation. Features: This optical glass prism is crafted with exactness for enhanced accuracy, boosting the preciseness of measurements. It exhibits exceptional transparency with a -17mm offset and 25.4mm diameter for sharp reflections. Enclosed in robust ABS plastic, it's engineered for long-term use and can be utilized with various surveying tools akin to Trimbles. It's ideal for tunnels, subways, and mines. The prism can be conveniently mounted on tripods with its internal brass adapter for effortless installation. Specification: Item Type: Total Station Prism Material: ABS Glass Diameter: Approx. 25.4mm / 1in Prism Constant: -17mm Application: For the testing of tunnels, subways, mines, highways, etc. Suitable for measuring instruments such as for Trimbles. Usage: Widely used in various industries such as subways, railways, tunnels, dams, steep slopes, etc.  Package List:1 x Total Station Prism Package List 1 x Total Station Prism