Measurement index: measurement range: 5m-10km measurement accuracy: ≤ 2km, error ± 2%, 2km-10km, error ± 5% ≥ 10km, error ± 10% instrument consistency: ≤± 4% update interval: 15s linear dynamic range: 3000:1 mechanical index: size (length x width x height): 610mm x 230mm x 300mm weight: less than 10kg installation: installed on the erected circular column material: anodized hard aluminum, Power index of painting protection on the outer surface: power supply: AC 110VAC / 220VAC ± 20% or DC 12VDC power: less than 5W, typical value 4W optical index: scattering angle coverage: 39o-51o front scattering peak wavelength: 870nm bandwidth: 100nm spectral response: the maximum response is 870nm, 0.65 A / W environmental adaptability: working environment temperature: - 40 - + 60 ℃ working relative humidity: 0-100% regional adaptability: continuous use in coastal areas reliability and maintenance cycle: mean time between failures (MTBF): more than 18000 hours cleaning optical lens: 3 months, or depending on the use environment