The innovative DT-100 Series are the world’s first waterproof and dustproof digital theodolites. They can stand up to any "wet-weather" or dust condition in the field (DT-102/103/104 based on IP-66, DT-101 based on IP-42). The benefit is that you will experience no downtime on the job due to inclement weather. There are four models to choose from: the 2" DT-101, the 5" DT-102, the 7" DT-103, and the 10" DT-104. All models are compact, lightweight, and simple to operate. The easy-to-use DT-104 is ideal for all construction applications.