Sokkia Electronic Digital Theodolites, The DT 520 and DT 520A series of are the same except that the DT20A has the single digital display on one side and is less expensive. Both digital electronic theodolites read to 1 sec. 5 sec. with an accuracy of 5 seconds. 200 hours on a single set of batteries that is almost 1 month of use. Sokkia's finest electronic digital theodolites. Sokkia Electronic digital theodolites, for precise angle measurement
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