--- title: "MeasurementDevice" language: "en" type: "Entity" summary: "Measurement devices and tools." canonical_url: "https://reference.wolfram.com/language/ref/entity/MeasurementDevice.html" source: "Wolfram Language Documentation" related_guides: - title: "Entity Types" link: "https://reference.wolfram.com/language/guide/EntityTypes.en.md" - title: "Life Sciences & Medicine: Data & Computation" link: "https://reference.wolfram.com/language/guide/LifeSciencesAndMedicineDataAndComputation.en.md" - title: "Physics & Chemistry: Data and Computation" link: "https://reference.wolfram.com/language/guide/PhysicsAndChemistryDataAndComputation.en.md" --- # MeasurementDevice Measurement devices and tools. [Related Interpreter](https://reference.wolfram.com/language/ref/interpreter/MeasurementDevice.en.md) Entity["MeasurementDevice", name] or Entity[...] represents an entity of type "MeasurementDevice". Entity[...][prop] gives the value of a specified property. Entity[...][{propi, …}] gives the value of a list of properties. EntityClass["MeasurementDevice", {propi -> speci, …}] represents a class of entities with values of propi defined by speci. ## Sample Entities * Entity["MeasurementDevice", "Barograph"]Entity["MeasurementDevice", "BourdonGauge"]Entity["MeasurementDevice", "ClockQuartz"]Entity["MeasurementDevice", "DosimeterQuartzFiber"]Entity["MeasurementDevice", "GyroscopeFO"]Entity["MeasurementDevice", "HallEffectSensor"]Entity["MeasurementDevice", "HydrogenSensor"]Entity["MeasurementDevice", "InfraredThermometer"]Entity["MeasurementDevice", "LaserRangefinder"]Entity["MeasurementDevice", "PipetteVolumetric"]Entity["MeasurementDevice", "ScaleAnalyticalBalance"]**…** ## Sample Entity Classes * EntityClass["MeasurementDevice", "Acceleration"]EntityClass["MeasurementDevice", "AirPressure"]EntityClass["MeasurementDevice", "Distance"]EntityClass["MeasurementDevice", "DoseEquivalentRate"]EntityClass["MeasurementDevice", "ElectricPotentialDifference"]EntityClass["MeasurementDevice", "GravitationalAcceleration"]EntityClass["MeasurementDevice", "MagneticFieldStrength"]EntityClass["MeasurementDevice", "Navigation"]EntityClass["MeasurementDevice", "RainFall"]EntityClass["MeasurementDevice", "RadiantEfficiency"]EntityClass["MeasurementDevice", "RadiantEnergy"]EntityClass["MeasurementDevice", "Temperature"]EntityClass["MeasurementDevice", "Time"]EntityClass["MeasurementDevice", "Weight"]**…** ## Properties | | | | ------------------ | ------------------- | | AlternateNames | alternate names | | Description | description | | EntityClasses | entity classes | | EntityTypeList | entity type list | | InstanceOf | instance of | | MeasuredQuantities | measured quantities | | Name | name | | NormalPrecision | normal precision | | NormalRange | normal range | | SpecificInstances | specific instances | ## Details * ``"MeasurementDevice"`` entities consist of generic and specific devices for measuring physical quantities. * ``"MeasurementDevice"`` entity classes include groupings based on the physical quantity measured as well as specific groupings based on the field of use. * Some properties are available for the ``"MeasurementDevice"`` entity type as a whole and can be given using the form ``EntityValue["MeasurementDevice", property]``. Such properties include: | | | | ----------------------------- | ------------------------------------------------------------------ | | "Properties" | the list of available properties | | "PropertyCanonicalNames" | the standard names of available properties | | "SampleEntities" | a sample list of available entities (typically of length 10) | | "SampleEntityClasses" | a sample list of available entity classes (typically of length 10) | | "EntityCount" | number of entities available | | "Entities" | the list of available entities | | "EntityCanonicalNames" | the standard names of available entities | | "EntityClasses" | the list of available entity classes | | "EntityClassCanonicalNames" | the standard names of available entity classes | | "PropertyClasses" | the list of available property classes | | "PropertyClassCanonicalNames" | the standard names of available property classes | | "PropertyCount" | number of properties available | * The following annotations can be used in the third argument of ``EntityValue["MeasurementDevice", property, annotation]`` : | | | | --- | --- | | "Source" | source information for the property | | "Date" | the date associated with the entity-property value (if any) | | "EntityAssociation" | an association of entities and entity-property values | | "PropertyAssociation" | an association of properties and entity-property values | | "EntityPropertyAssociation" | an association in which the specified entities are keys, and values are a nested association of properties and entity-property values | | "PropertyEntityAssociation" | an association in which the specified properties are keys, and values are a nested association of entities and entity-property values | | "Dataset" | a dataset in which the specified entities are keys, and values are an association of property names and entity-property values | * The following annotations can be used in the second argument of ``EntityValue[property, annotation]`` : | | | | ------------------------ | --------------------------------------------------------------- | | "Qualifiers" | the list of possible qualifiers for the property | | "QualifierValues" | the list of possible values that can be given to each qualifier | | "DefaultQualifierValues" | the list of default values for the property's qualifiers | | "Description" | a brief textual description of the property | | "Definition" | a detailed textual definition of the property | | "PhysicalQuantity" | the physical quantity associated with the entity-property value | | "Unit" | the unit associated with the entity-property value | * A qualifier value of ``Automatic`` indicates that an applicable format of values can be used; e.g. for the ``"Date"`` qualifier, this includes a proper date or date span. --- ## Examples (6) ### Basic Examples (4) Use ctrl+= for entity discovery: ```wl In[1]:= [image] Out[1]= Entity["MeasurementDevice", "Barometer"] ``` --- Find a property value for an entity: ```wl In[1]:= Entity["MeasurementDevice", "AstrolabeMariner"]["MeasuredQuantities"] Out[1]= {Angle, Latitude} ``` --- Retrieve a dataset of all available properties for an entity: ```wl In[1]:= Entity["MeasurementDevice", "DosimeterQuartzFiber"]["Dataset"] Out[1]= Dataset[Association[EntityProperty["MeasurementDevice", "AlternateNames"] -> {"self indicating pocket dosimeter", "SIPD", "self reading pocket dosimeter", "SRPD", "rate meter", "pocket ionization chamber"}, EntityProperty["MeasurementDe ... Property["MeasurementDevice", "NormalRange"] -> {QuantityVariable["IonizingRadiationEffectiveDose"] -> Quantity[Interval[{0, 500}], "Millirems"]}, EntityProperty["MeasurementDevice", "SpecificInstances"] -> Missing["NotAvailable"]]] ``` --- Find all devices that are an instance of a gyroscope: ```wl In[1]:= EntityClass["MeasurementDevice", {"InstanceOf" -> ContainsAll[{Entity["MeasurementDevice", "Gyroscope"]}]}]//EntityList Out[1]= {Entity["MeasurementDevice", "Gyrocompass"], Entity["MeasurementDevice", "GyroscopeDT"], Entity["MeasurementDevice", "GyroscopeFO"], Entity["MeasurementDevice", "GyroscopeHR"], Entity["MeasurementDevice", "GyroscopeMEMS"], Entity["MeasurementDevice", "GyroscopeVS"], Entity["MeasurementDevice", "Gyrostat"], Entity["MeasurementDevice", "LondonMoment"], Entity["MeasurementDevice", "RateGyro"], Entity["MeasurementDevice", "RingLaserGyroscope"], Entity["MeasurementDevice", "YawRateSensor"]} ``` ### Applications (2) Explore the range of pressure-measuring devices: ```wl In[1]:= data = Normal[DeleteCases[EntityValue[EntityClass["MeasurementDevice", "Pressure"], EntityProperty["MeasurementDevice", "NormalRange"], "EntityAssociation"], _Missing]] Out[1]= {Entity["MeasurementDevice", "SphygmomanometerAneroid"] -> {Pressure -> Quantity[Interval[{60, 200}], "MillimetersOfMercury"]}, Entity["MeasurementDevice", "BourdonGauge"] -> {Pressure -> Quantity[Interval[{1, 1000}], "Millibars"]}, Entity["Measure ... Entity["MeasurementDevice", "PressureGauge"] -> {Pressure -> Quantity[Interval[{Rational[1, 100000000000], 10}], "Millibars"]}, Entity["MeasurementDevice", "Sphygmomanometer"] -> {Pressure -> Quantity[Interval[{60, 200}], "MillimetersOfMercury"]}} In[2]:= Manipulate[NumberLinePlot[QuantityVariable["Pressure"] /. #[[2]]& /@ data, PlotRange -> {0, 10 ^ t}, PlotLegends -> data[[All, 1]]], {{t, 6}, -5, 6, 1}, SaveDefinitions -> True] Out[2]= DynamicModule[«9»] ``` --- Explore the interconnections between different speed-measuring devices: ```wl In[1]:= class = EntityClass["MeasurementDevice", "Speed"]; instances = Flatten[Normal[DeleteCases[EntityValue[class, EntityProperty["MeasurementDevice", "SpecificInstances"], "EntityAssociation"], _Missing]] /. HoldPattern[e_ -> l_] :> Map[Rule[e, #]&, l]]; instanceof = Flatten[Normal[DeleteCases[EntityValue[class, EntityProperty["MeasurementDevice", "InstanceOf"], "EntityAssociation"], _Missing]] /. HoldPattern[e_ -> l_] :> Map[Rule[#, e]&, l]]; In[2]:= GraphPlot[Union[instances, instanceof], DirectedEdges -> True] Out[2]= [image] ``` ## See Also * [`FrequencyAllocation`](https://reference.wolfram.com/language/ref/entity/FrequencyAllocation.en.md) * [`BroadcastStation`](https://reference.wolfram.com/language/ref/entity/BroadcastStation.en.md) * [`MedicalTest`](https://reference.wolfram.com/language/ref/entity/MedicalTest.en.md) * [`NuclearTestSite`](https://reference.wolfram.com/language/ref/entity/NuclearTestSite.en.md) * [`ParticleAccelerator`](https://reference.wolfram.com/language/ref/entity/ParticleAccelerator.en.md) * [`PhysicalQuantity`](https://reference.wolfram.com/language/ref/entity/PhysicalQuantity.en.md) * [`WeatherStation`](https://reference.wolfram.com/language/ref/entity/WeatherStation.en.md) * [`MeasurementDevice`](https://reference.wolfram.com/language/ref/interpreter/MeasurementDevice.en.md) * [`ComputedMeasurementDevice`](https://reference.wolfram.com/language/ref/interpreter/ComputedMeasurementDevice.en.md) * [`ComputedFrequencyAllocation`](https://reference.wolfram.com/language/ref/interpreter/ComputedFrequencyAllocation.en.md) * [`ComputedMedicalTest`](https://reference.wolfram.com/language/ref/interpreter/ComputedMedicalTest.en.md) * [`ComputedNuclearTestSite`](https://reference.wolfram.com/language/ref/interpreter/ComputedNuclearTestSite.en.md) * [`ComputedParticleAccelerator`](https://reference.wolfram.com/language/ref/interpreter/ComputedParticleAccelerator.en.md) * [`ComputedPhysicalSystem`](https://reference.wolfram.com/language/ref/interpreter/ComputedPhysicalSystem.en.md) * [`ComputedWeatherStation`](https://reference.wolfram.com/language/ref/interpreter/ComputedWeatherStation.en.md) * [`FrequencyAllocation`](https://reference.wolfram.com/language/ref/interpreter/FrequencyAllocation.en.md) * [`MedicalTest`](https://reference.wolfram.com/language/ref/interpreter/MedicalTest.en.md) * [`NuclearTestSite`](https://reference.wolfram.com/language/ref/interpreter/NuclearTestSite.en.md) * [`ParticleAccelerator`](https://reference.wolfram.com/language/ref/interpreter/ParticleAccelerator.en.md) * [`PhysicalSystem`](https://reference.wolfram.com/language/ref/interpreter/PhysicalSystem.en.md) * [`WeatherStation`](https://reference.wolfram.com/language/ref/interpreter/WeatherStation.en.md) * [`MeasurementDevice`](https://reference.wolfram.com/language/ref/textcontent/MeasurementDevice.en.md) * [`TinkerForgeWeatherStation`](https://reference.wolfram.com/language/ref/device/TinkerForgeWeatherStation.en.md) * [`WeatherStation`](https://reference.wolfram.com/language/ref/device/WeatherStation.en.md) ## Related Guides * [Entity Types](https://reference.wolfram.com/language/guide/EntityTypes.en.md) * [Life Sciences & Medicine: Data & Computation](https://reference.wolfram.com/language/guide/LifeSciencesAndMedicineDataAndComputation.en.md) * [Physics & Chemistry: Data and Computation](https://reference.wolfram.com/language/guide/PhysicsAndChemistryDataAndComputation.en.md) ## History * [Introduced in 2019 (12.0)](https://reference.wolfram.com/language/guide/SummaryOfNewFeaturesIn120.en.md)