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ETH - Series   The ETH-200 Series features model numbers that reflect angle accuracy and have common features. All models have dual displays, and a detachable tribrach. The ETH-205 has 5", the ETH-210 has 10", and the ETH-220 has 20" angle accuracy. Horizontal and vertical angles can be observed simultaneously on the large 2 line, back-lit LCD displays, and vertical angles can be easily converted to percent slope with one key stroke. Other standard features include a horizontal angle zero set, automatic power off to conserve batteries, and a battery life indicator on the LCD display. Five AA alkaline batteries provide 15 hours of continuous operation. ETH-200 Series Theodolite Features The 30X high power telescope has exceptionally sharp resolution for sighting on even the smallest mark. This design also has excellent light gathering for use in low light inside job sites. Easy-to-Read Display panels have a large and easy to read high contrast LCD with back-light illumination. Simple, logical keyboard and mode display provide maximum operator convenience Simplified Operation With the touch of a key, horizontal angles; can be set to zero, can be switched between right and left reading, can be retained with the HOLD key and vertical angles can be converted to percent of slope Coaxial Tangent / Locks Motion locks are located next to the slow motion knobs to make it easier and quicker to sight on a point. Automatic Power Off prevents unnecessary battery drainage. The remaining battery capacity is indicated on the display The 2x optical plummet can focus at any distance from 20 inches to infinity to handle setups of any type.