measuring range 10m~5000m survey precision ?0% data transmission RS 232long-line driver(optional) data revision rate 1/min weight 2.8Kg size 640?50?20mm working power(optional) voltage 9V~15V power dissipation >10W working conditions environment temperature -45℃~+50℃ relative humidity 0~100%RH air pressure ≥65KPa wind-resistance intensity ≤0~160Km/h Main character day night observation of atmospheric visibility Monitoring, showing the work situation and alarming to the self-direct current power, inner temperature, strong ambient light etc signals With full auto-digitalization check-zero function, to guarantee long time working's steady and accuracy Optical lens' heating and defrosting function The apparatus has many parameters, setting parameters and saving after turn down the power, which can be opened to customers for operating maintenance.