Easy-to-use, accurate instruments for construction and survey environments Designed for general construction and survey applications. Nikon NE-101 Series electronic digital theodolites from TDS give you accurate measurements in an affordable, easy-to-use platform. Nikon NE-101 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 it features five easy-to-use, one-touch keys: four to perform all common functions and a fifth to control the backlit LCD display and reticule 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.It offers 7-Inch angles accuracies. Extra light for dark conditions, it features a built-in reticule illuminator and backlit LCD display t These features also come in handy during low-light conditions outdoors. It has an IP54 rating, meaning water can splash on them from any direction with no harmful effects. 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. These theodolites are built tough to withstand the harsh environments common to many construction job sites. Resistant to water and dust, these rugged units are designed to reduce downtime for repairs. A small carrying case holds the theodolite, manual, and tools.