Prisms

Prism assembly systems are essential to the arsenal of surveying engineers and construction professionals, giving versatility and a variety of settings to help get more accurate data. Suitable for prism poles, the Northwest Instrument Nikon Compatible Single Prism Package NPA31 is built for durable and stable pole mounting. This prism offset is sure to help attain more accurate data in measuring distances. As a retroreflector, the prism offset is often used with electronic distance measuring (EDM) instruments. The offsets correct a measured distance by altering the transmission of the light beams from the EDM. It also has a 5/8-inch x 11 thread size, making it easily compatible with most mounts, poles, tripods, and more.