Southland Sensing Ltd. - Southland Sensing Ltd. Precision Oxygen Sensors oxygen sensor, O2 sensor, trace oxygen, trace O2 Sensor, sensor, O2 cell, microfuel cell, fuel cell, oxygen analyzer, O2 analyzer, oxygen transmitter, O2 transmitter, portable oxygen analyzer, ppm O2 analyzer, % O2 analyzer, PPM O2, % O2, diving O2 sensor, rebreather O2 sensor, Teledyne B-2C, A-2C, PSR-12-223, PSR-11-21, PSR-11-23, L-2C, Insta Trace Southland Sensing is a precision analytical instrumentation company specializing in ppm (Trace) oxygen sensors, controllers and accessories.