This code system http://hl7.org/fhir/measurement-principle defines the following codes:

CodeDisplayDefinition
otherMSP OtherMeasurement principle isn't in the list.
chemicalMSP ChemicalMeasurement is done using the chemical principle.
electricalMSP ElectricalMeasurement is done using the electrical principle.
impedanceMSP ImpedanceMeasurement is done using the impedance principle.
nuclearMSP NuclearMeasurement is done using the nuclear principle.
opticalMSP OpticalMeasurement is done using the optical principle.
thermalMSP ThermalMeasurement is done using the thermal principle.
biologicalMSP BiologicalMeasurement is done using the biological principle.
mechanicalMSP MechanicalMeasurement is done using the mechanical principle.
acousticalMSP AcousticalMeasurement is done using the acoustical principle.
manualMSP ManualMeasurement is done using the manual principle.

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