The OCMA-310 is portable unit for monitoring oil content in both fresh water and salt water. The OCMA-310 utilizes an S-316 extraction solvent to ensure superior oil particle stability and infrared absorptiometry for sample analysis. Using 0 mg/l - 200 mg/l dynamic ranging, the unit is capable of analyzing high and low concentrations. The OCMA-310 provides swift, highly accurate analysis of the oil content of both fresh water and salt water.