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The ETH-300 Series features model numbers that reflect angle accuracy and have common features. All models have dual displays, and a detachable tribrach.
The ETH-302 has 23 accuracy, ETH-305 has 53, the ETH-310 has 103, and the ETH-320 has 203 angle accuracy. The ETH-302 and ETH-305 are equipped with compensator.
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. Four AA alkaline batteries provide 25 - 28 hours of continuous operation.