The  MA2390-3 uses the patented ALMEMO connection system, whereby sensor-specific parameters are stored in non-volatile memory in the sensor's connection plug and remain with the sensor! More than 65 measuring ranges are available for the MA2390-3, as are a wide variety of factory-made sensors including those to measure pressure, liquid and air flow, temperature, light intensity, pH,  conductivity, gas concentration (CO2, O2, and CO), relative humidity, rotational speed, linear displacement, etc.. Also, inexpensive ALMEMO connection plugs are available for connecting devices with electrical outputs to the logger. With these "blank" plugs, virtually any sensor with a linear signal output may be connected and programmed to display in correct engineering units and scaling factor.

Sensor calibration changes may be made via microprocessor interface, whereby zero and span changes may be made easily and  accurately, and the changes remain with the sensor because they are stored in the sensor's connection plug. For certain sensors,  multiple measurements (4 max.) are available from each input channel. For instance, with a relative humidity probe the air  temperature and the relative humidity as well as the calculated variables dew point, mixture ratio, or partial vapor pressure may be viewed. All from a sensor plugged into one input socket.

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