Easy-to-use, accurate instruments for construction and survey environments. Designed for general construction and survey applications, Nikon NE-103 Series electronic digital theodolites from TDS give you accurate measurements in an affordable, easy-to-use platform. Nikon NE-100 Series theodolites can run 48 hours under normal operating conditions on a set of six AA alkaline batteries. Each of the four models has an ergonomic keypad with one-touch keys for all functions and a large, backlit LCD display help you work productively in the field. One-touch keys for common functions. NE-103 series theodolites feature five easy-to-use, one-touch keys: four to perform all common functions and a fifth to control the backlit LCD display and reticle illumination. You can instantly convert vertical angles to percent of grade, reset the horizontal angle to zero and lock the horizontal angle displayed on the LCD while you reposition or repeat a measurement. The 103 model offers 5-Inch angle accuracy. Extra light for dark conditions this series features a built-in reticle illuminator and backlit LCD display that allow you to work inside buildings as well as in tunnels, mines and other environments with little or no light. These features also come in handy during low-light conditions outdoors, such as near dawn or dusk. Rugged, all-weather reliability. With the Nikon NE-103 Series theodolite models, you can count on reliable performance in tough conditions.It has a higher rating of IP56 which means it is waterproof and dustproof. Works longer on standard AA batteries Unlike other instruments that require specialized batteries, it uses six standard AA alkaline batteries. Those batteries can power all models for about 48 hours. A three-level bar graph on the LCD screen displays remaining battery power. Built to perform, it performs well in rugged environments.It has a vertical compensator.