The Datatest Model 80 microprocessor based portable opacity monitor offers heavyweight features in a lightweight package. The pulsed L.E.D. transceiver with the probe weighs just 14 lbs. The microprocessor based control unit has a 80 character backlit L.C.D. with keypad for programming and instrument operation. Comes with recorder and serial port interfaces. A purge air blower with hose can be part of the package. Perfect for precipitator or baghouse performance verification or multiple stack sources that require periodic not continuous opacity monitoring.