Enhance your surveying and measurement capabilities with this professional-grade diagonal eyepiece specifically designed for DT series theodolites. This Model 13 eyepiece offers superior viewing flexibility and comfort during extended measurement sessions. Featuring precision-engineered Japanese optics housed in a robust black metal frame, this accessory delivers crystal-clear views at various angles. Installation is straightforward with a simple three-step process utilizing a secure clockwise/counterclockwise rotation mechanism. Weighing just 16 ounces, this portable optical accessory comes complete with a durable protective carrying case featuring a convenient zipper closure for safe storage and transport. The thoughtfully designed construction ensures reliable performance in field conditions while maintaining optical clarity and accuracy. Perfect for surveyors and construction professionals who require precise measurements and comfortable viewing angles in their daily work. Compatible exclusively with DT series theodolites, this eyepiece represents an essential tool for professional surveying applications.