... seen up to 50 meters away DT-200LThe new DT-200L Series feature the same high-quality advanced absolute circle reading ... that's perfect for easy, one-person alignment jobs.DT-200L Series Features: Long Battery Life Waterproof and Dustproof Digital Theodolites ... 5", 7", or 9" angle accuracy, there is a DT-200L theodolite perfect for any job. They feature waterproof and dustproof ...