... engine 4:Warranty period one year SV-2LB-filter semi-automatic Smoke meter SV-2LB-filter semiautomatic Smoke meter, ... black granule on the filter paper (unit: Rb ). SV-2LB, equipped with Nixie tube, is easy to operate ... average of them. Addition: The strong point of SV-2LB: Air compression is not needed while it works ... : 85Sampling tube: cylinder: 5mm, length: 5m.Products show: SV-2LB Car Smoke Meter