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Very few sensors are capable of operating across a range of environment without changing calibration as a result. Traditionally devices have been compensated by means of the analogue interface electronics, perhaps by inclusion of a thermistor for temperature trimming. Indeed devices were sometimes provided with a look-up table or graph to enable manual calibration. Ironically the look-up table approach has been brought up to date as one of the techniques used in digital software compensation. The use of a microcontroller can also enable more sophisticated mathematical modelling and curve fitting to be employed often as a result of secondary sensor measurements. It can sometimes be beneficial to remove less sophisticated analogue compensation from a commercial device, so that a digital solution can be applied more effectively.