measuring range 10 m~50000m survey precision <10000m ?0% ≥100000m ?0% communication interface RS 232long-line driver(optional) data revision rate 1/min weight ≤50 kg size ≤2.3m working power(optional) voltage 220V?0%;50?Hz power dissipation When no-heating≤15W;heating≤100W working conditions ambient temperature -45℃~+50℃ air humidity 0~100%RH salt-fog resistant function Using in littoral wind-resistance intensity (0?60)km/h degree of protection IP65 main function day night observation of atmospheric visibility Adopting double-shielding conductor with less than 3km transmission distance Monitored self-Volts d. c. (14.4-15.6V). light source power (7.8-8.3V)