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Model OI-820

The Otis Instruments, Inc. Model OI-820 Notis is a stand alone gas monitor that is equipped with an OI-240HS MOS Solid State H2S Sensor.
Model OI-840

The Otis Instruments, Inc. Model OI-840 Notis is a stand alone gas monitor that is equipped with an Catalytic Bead Sensor for sensing combustible gas.
Model OI-840IR Notis

The Otis Instruments, Inc. Model OI-840IR Notis is a stand alone gas monitor that is equipped with an Infrared Sensor for sensing combustible gas.
Model OI-850

The Otis Instruments, Inc. Model OI-850 and OI-850-O2 Notis are stand alone gas monitors, each equipped with an Electrochemical Sensor.