--- title: Dwyer Instruments, Inc. Blog --- [![Dwyer Instruments, Inc.](https://info.dwyer-inst.com/hs-fs/hubfs/raw_assets/public/Dwyer_September2020/images/Dwyer.gif?width=500&height=250&name=Dwyer.gif "Dwyer Instruments, Inc.")](https://www.dwyer-inst.com/) - [Login or Register](https://www.dwyer-inst.com/LoginInfo/UserLanding.cfm) - English Español 中国的 - [Home](https://www.dwyer-inst.com/) - [Products](https://www.dwyer-inst.com/Products/) - [List by Product Model](https://www.dwyer-inst.com/Products/listbyProduct.cfm/?__hstc=255240215.13858999939db3d7c5d19a353988a851.1600663600633.1600674017012.1600676601784.3&__hssc=255240215.2.1600676601784&__hsfp=1047128449) - [List by Application](https://www.dwyer-inst.com/ApplicationsSearch/?__hstc=255240215.13858999939db3d7c5d19a353988a851.1600663600633.1600674017012.1600676601784.3&__hssc=255240215.2.1600676601784&__hsfp=1047128449) - [Product Categories](https://www.dwyer-inst.com/Products/) - [Pressure](https://www.dwyer-inst.com/Product/Pressure/) - [Accessories](https://www.dwyer-inst.com/Product/Pressure/Accessories/) - [Differential Pressure](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/) - [Data Loggers](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/DataLoggers/) - [Gages](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/Gages/) - [Gage / Switches - Dial](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/Gage-Switches-Dial/) - [Gage / Switches - Digital](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/Gage-Switches-Digital/) - [Room Status Monitors](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/RoomStatusMonitors/) - [Switches](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/Switches/) - [Transmitters](https://www.dwyer-inst.com/Product/Pressure/DifferentialPressure/Transmitters/) - [Manometers](https://www.dwyer-inst.com/Product/Pressure/Manometers/) - [Digital](https://www.dwyer-inst.com/Product/Pressure/Manometers/Digital/) - [Stationary](https://www.dwyer-inst.com/Product/Pressure/Manometers/Stationary/) - [Remote Displays](https://www.dwyer-inst.com/Product/Pressure/RemoteDisplays/) - [Single Pressure](https://www.dwyer-inst.com/Product/Pressure/SinglePressure/) - [Gages - Dial](https://www.dwyer-inst.com/Product/Pressure/SinglePressure/Gages-Dial/) - [Gages - Digital](https://www.dwyer-inst.com/Product/Pressure/SinglePressure/Gages-Digital/) - [Switches](https://www.dwyer-inst.com/Product/Pressure/SinglePressure/Switches/) - [Transmitters](https://www.dwyer-inst.com/Product/Pressure/SinglePressure/Transmitters/) - [Air Quality](https://www.dwyer-inst.com/Product/AirQuality/) - [Accessories](https://www.dwyer-inst.com/Product/AirQuality/Accessories/) - [Occupancy Sensors](https://www.dwyer-inst.com/Product/AirQuality/OccupancySensors/) - [Humidity Switches](https://www.dwyer-inst.com/Product/AirQuality/HumiditySwitches/) - [Humidity / Temperature Transmitters](https://www.dwyer-inst.com/Product/AirQuality/Humidity-TemperatureTransmitters/) - [Air Flow Switches](https://www.dwyer-inst.com/Product/AirQuality/AirFlowSwitches/) - [Temperature / Humidity Switches](https://www.dwyer-inst.com/Product/AirQuality/Temperature-HumiditySwitches/) - [Pitot Tubes](https://www.dwyer-inst.com/Product/AirQuality/PitotTubes/) - [Fume Hood Monitors](https://www.dwyer-inst.com/Product/AirQuality/FumeHoodMonitors/) - [Carbon Dioxide Transmitters](https://www.dwyer-inst.com/Product/AirQuality/CarbonDioxideTransmitters/) - [Carbon Monoxide Transmitters](https://www.dwyer-inst.com/Product/AirQuality/CarbonMonoxideTransmitters/) - [Flow Sensors](https://www.dwyer-inst.com/Product/AirQuality/FlowSensors/) - [Smoke Detector](https://www.dwyer-inst.com/Product/AirQuality/SmokeDetector/) - [Air Velocity Transmitters](https://www.dwyer-inst.com/Product/AirQuality/AirVelocityTransmitters/) - [Air Velocity](https://www.dwyer-inst.com/Product/AirVelocity/) - [Air Velocity Transmitter](https://www.dwyer-inst.com/Product/AirVelocity/AirVelocityTransmitter/) - [Vaneometers](https://www.dwyer-inst.com/Product/AirVelocity/Vaneometers/) - [Windmeters](https://www.dwyer-inst.com/Product/AirVelocity/Windmeters/) - [Flow](https://www.dwyer-inst.com/Product/Flow/) - [Flow Indicators / Controllers](https://www.dwyer-inst.com/Product/Flow/FlowIndicators-Controllers/) - [Flow Sensors](https://www.dwyer-inst.com/Product/Flow/FlowSensors/) - [In-Line (Averaging Pitot Tube)](https://www.dwyer-inst.com/Product/Flow/FlowSensors/In-Line-AveragingPitotTube-/) - [Flow Switches](https://www.dwyer-inst.com/Product/Flow/FlowSwitches/) - [Paddle](https://www.dwyer-inst.com/Product/Flow/FlowSwitches/Paddle/) - [Piezo](https://www.dwyer-inst.com/Product/Flow/FlowSwitches/Piezo/) - [Shuttle / Piston](https://www.dwyer-inst.com/Product/Flow/FlowSwitches/Shuttle-Piston/) - [Thermal](https://www.dwyer-inst.com/Product/Flow/FlowSwitches/Thermal/) - [Flow Transmitters](https://www.dwyer-inst.com/Product/Flow/FlowTransmitters/) - [Accessories](https://www.dwyer-inst.com/Product/Flow/FlowTransmitters/Accessories/) - [Adjustable Insertion, Fittings](https://www.dwyer-inst.com/Product/Flow/FlowTransmitters/AdjustableInsertion-Fittings/) - 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[Electromagnetic, Thermal Energy Meter](https://www.dwyer-inst.com/Product/Flow/FlowTransmitters/Electromagnetic-ThermalEnergyMeter/) - [Flowmeters](https://www.dwyer-inst.com/Product/Flow/Flowmeters/) - [Dial](https://www.dwyer-inst.com/Product/Flow/Flowmeters/Dial/) - [In-Line](https://www.dwyer-inst.com/Product/Flow/Flowmeters/In-Line/) - [Orifice Plate](https://www.dwyer-inst.com/Product/Flow/Flowmeters/OrificePlate/) - [Totalizing Meters](https://www.dwyer-inst.com/Product/Flow/Flowmeters/TotalizingMeters/) - [Ultrasonic](https://www.dwyer-inst.com/Product/Flow/Flowmeters/Ultrasonic/) - [Variable Area](https://www.dwyer-inst.com/Product/Flow/Flowmeters/VariableArea/) - [Venturi](https://www.dwyer-inst.com/Product/Flow/Flowmeters/Venturi/) - [With Switch Output](https://www.dwyer-inst.com/Product/Flow/Flowmeters/WithSwitchOutput/) - [Mass Flowmeters and Controllers](https://www.dwyer-inst.com/Product/Flow/MassFlowmetersandControllers/) - [Sight Flow Indicators](https://www.dwyer-inst.com/Product/Flow/SightFlowIndicators/) - [Water Meters](https://www.dwyer-inst.com/Product/Flow/WaterMeters/) - [Level](https://www.dwyer-inst.com/Product/Level/) - [Bin Vibrators](https://www.dwyer-inst.com/Product/Level/BinVibrators/) - [Level Indicators](https://www.dwyer-inst.com/Product/Level/LevelIndicators/) - [Level Switches](https://www.dwyer-inst.com/Product/Level/LevelSwitches/) - [Capacitive](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Capacitive/) - [Conductivity](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Conductivity/) - [Diaphragm](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Diaphragm/) - [Displacer](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Displacer/) - [Float](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Float/) - [Optical](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Optical/) - [Paddle](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Paddle/) - [Rod](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Rod/) - [Tilt](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Tilt/) - [Tuning Fork](https://www.dwyer-inst.com/Product/Level/LevelSwitches/TuningFork/) - [Level Transmitters](https://www.dwyer-inst.com/Product/Level/LevelTransmitters/) - [Capacitive](https://www.dwyer-inst.com/Product/Level/LevelSwitches/Capacitive/) - [Float](https://www.dwyer-inst.com/Product/Level/LevelTransmitters/Float/) - [Submersible](https://www.dwyer-inst.com/Product/Level/LevelTransmitters/Submersible/) - [Ultrasonic](https://www.dwyer-inst.com/Product/Level/LevelTransmitters/Ultrasonic/) - [Pump Controllers](https://www.dwyer-inst.com/Product/Level/PumpControllers/) - [Water Leak Detectors](https://www.dwyer-inst.com/Product/Level/WaterLeakDetectors/) - [Temperature](https://www.dwyer-inst.com/Product/Temperature/) - [Din Rail Temperature Controllers](https://www.dwyer-inst.com/Product/Temperature/DinRailTemperatureControllers/) - [Indicators](https://www.dwyer-inst.com/Product/Temperature/Indicators/) - [Digital](https://www.dwyer-inst.com/Product/Temperature/Indicators/Digital/) - [Labels / Strips](https://www.dwyer-inst.com/Product/Temperature/Indicators/Labels-Strips/) - [Process Controllers](https://www.dwyer-inst.com/Product/Temperature/ProcessControllers/) - [Sensors](https://www.dwyer-inst.com/Product/Temperature/Sensors/) - [Software](https://www.dwyer-inst.com/Product/Temperature/Software/) - [Switches](https://www.dwyer-inst.com/Product/Temperature/Switches/) - [Digital Panel Mount](https://www.dwyer-inst.com/Product/Temperature/Switches/DigitalPanelMount/) - [Limit](https://www.dwyer-inst.com/Product/Temperature/Switches/Limit/) - [Mechanical](https://www.dwyer-inst.com/Product/Temperature/Switches/Mechanical/) - [Transmitters](https://www.dwyer-inst.com/Product/Temperature/Transmitters/) - [Thermocouple Thermometers, Digital](https://www.dwyer-inst.com/Product/Temperature/ThermocoupleThermometers-Digital/) - [Thermometers](https://www.dwyer-inst.com/Product/Temperature/Thermometers/) - [Dial](https://www.dwyer-inst.com/Product/Temperature/Thermometers/Dial/) - [Digital](https://www.dwyer-inst.com/Product/Temperature/Thermometers/Digital/) - [Spirit-Filled](https://www.dwyer-inst.com/Product/Temperature/Thermometers/Spirit-Filled/) - [Thermostats](https://www.dwyer-inst.com/Product/Temperature/Thermostats/) - [Weatherproof Enclosures](https://www.dwyer-inst.com/Product/Temperature/WeatherproofEnclosures/) - [Process Control](https://www.dwyer-inst.com/Product/ProcessControl/) - [Chart Recorders](https://www.dwyer-inst.com/Product/ProcessControl/ChartRecorders/) - [Current Transformers / Switches](https://www.dwyer-inst.com/Product/ProcessControl/CurrentTransformers-Switches/) - [Data Loggers, Indicating](https://www.dwyer-inst.com/Product/ProcessControl/DataLoggers-Indicating/) - [Data Loggers, Miniature](https://www.dwyer-inst.com/Product/ProcessControl/DataLoggers-Miniature/) - [Data Loggers, USB](https://www.dwyer-inst.com/Product/ProcessControl/DataLoggers-USB/) - [Enclosures](https://www.dwyer-inst.com/Product/ProcessControl/Enclosures/) - [Fan Speed Controllers](https://www.dwyer-inst.com/Product/ProcessControl/FanSpeedControllers/) - [Indicating Annunciators](https://www.dwyer-inst.com/Product/ProcessControl/IndicatingAnnunciators/) - [Intrinsically Safe Barriers](https://www.dwyer-inst.com/Product/ProcessControl/IntrinsicallySafeBarriers/) - [Motion/Safety Switches](https://www.dwyer-inst.com/Product/ProcessControl/Motion-SafetySwitches/) - [Panel Meters/Indicators](https://www.dwyer-inst.com/Product/ProcessControl/PanelMeters-Indicators/) - [Particulate (Dust or Broken Bag) Sensors](https://www.dwyer-inst.com/Product/ProcessControl/Particulate-DustorBrokenBag-Sensors/) - [Particulate (Dust or Broken Bag) Transmitters](https://www.dwyer-inst.com/Product/ProcessControl/Particulate-DustorBrokenBag-Transmitters/) - [Control Enclosures](https://www.dwyer-inst.com/Product/ProcessControl/ControlEnclosures/) - [Power Supplies and Transformers](https://www.dwyer-inst.com/Product/ProcessControl/PowerSuppliesandTransformers/) - [Process Alarm Switch Modules](https://www.dwyer-inst.com/Product/ProcessControl/ProcessAlarmSwitchModules/) - [Relays](https://www.dwyer-inst.com/Product/ProcessControl/Relays/) - [Signal Conditioning Modules](https://www.dwyer-inst.com/Product/ProcessControl/SignalConditioningModules/) - [Signal Converter](https://www.dwyer-inst.com/Product/ProcessControl/SignalConverter/) - [SSR Monitors](https://www.dwyer-inst.com/Product/ProcessControl/SSRMonitors/) - [Timer Boards](https://www.dwyer-inst.com/Product/ProcessControl/TimerBoards/) - [Timers](https://www.dwyer-inst.com/Product/ProcessControl/Timers/) - [Vibration Control](https://www.dwyer-inst.com/Product/ProcessControl/VibrationControl/) - [Data Loggers & Recorders](https://www.dwyer-inst.com/Product/DataLoggers-Recorders/) - [Data Loggers](https://www.dwyer-inst.com/Product/DataLoggers-Recorders/DataLoggers/) - [Data Loggers, Wireless](https://www.dwyer-inst.com/Product/DataLoggers-Recorders/DataLoggers-Wireless/) - [Software](https://www.dwyer-inst.com/Product/DataLoggers-Recorders/Software/) - [Test Equipment](https://www.dwyer-inst.com/Product/TestEquipment/) - [Air Flow Grids](https://www.dwyer-inst.com/Product/TestEquipment/AirFlowGrids/) - [Air Flow Hood](https://www.dwyer-inst.com/Product/TestEquipment/AirFlowHood/) - [Backflow Test Kit](https://www.dwyer-inst.com/Product/TestEquipment/BackflowTestKit/) - [Calibration Pumps](https://www.dwyer-inst.com/Product/TestEquipment/CalibrationPumps/) - [Clamp Multimeters](https://www.dwyer-inst.com/Product/TestEquipment/ClampMultimeters/) - [Distance Meter](https://www.dwyer-inst.com/Product/TestEquipment/DistanceMeter/) - [Gas Analyzers/Kits](https://www.dwyer-inst.com/Product/TestEquipment/GasAnalyzers-Kits/) - [Gas Leak Detectors](https://www.dwyer-inst.com/Product/TestEquipment/GasLeakDetectors/) - [Ground & Continuity Controls](https://www.dwyer-inst.com/Product/TestEquipment/Ground-ContinuityControls/) - [HVAC Balancing Instruments](https://www.dwyer-inst.com/Product/TestEquipment/HVACBalancingInstruments/) - [Light Meters](https://www.dwyer-inst.com/Product/TestEquipment/LightMeters/) - [Liquid Analyzers](https://www.dwyer-inst.com/Product/TestEquipment/LiquidAnalyzers/) - [Manometer](https://www.dwyer-inst.com/Product/TestEquipment/Manometer/) - [Air Velocity](https://www.dwyer-inst.com/Product/TestEquipment/Manometer/AirVelocity/) - [Portable](https://www.dwyer-inst.com/Product/TestEquipment/Manometer/Portable/) - [Moisture Meter](https://www.dwyer-inst.com/Product/TestEquipment/MoistureMeter/) - [Multimeters](https://www.dwyer-inst.com/Product/TestEquipment/Multimeters/) - [Pen Multimeters](https://www.dwyer-inst.com/Product/TestEquipment/PenMultimeters/) - [Pressure Calibrators](https://www.dwyer-inst.com/Product/TestEquipment/PressureCalibrators/) - [Signal Generators, Multimeters](https://www.dwyer-inst.com/Product/TestEquipment/SignalGenerators-Multimeters/) - [Pitot Tubes](https://www.dwyer-inst.com/Product/TestEquipment/PitotTubes/) - [Sound Meters/Calibrators](https://www.dwyer-inst.com/Product/TestEquipment/SoundMeters-Calibrators/) - [Tachometers](https://www.dwyer-inst.com/Product/TestEquipment/Tachometers/) - [Testers](https://www.dwyer-inst.com/Product/TestEquipment/Testers/) - [pH](https://www.dwyer-inst.com/Product/TestEquipment/Testers/pH/) - [Thermometers, Immersion](https://www.dwyer-inst.com/Product/TestEquipment/Thermometers-Immersion/) - [Thermometers, Infrared](https://www.dwyer-inst.com/Product/TestEquipment/Thermometers-Infrared/) - [Thermometers, Thermocouple](https://www.dwyer-inst.com/Product/TestEquipment/Thermometers-Thermocouple/) - [Thermo-Anemometers](https://www.dwyer-inst.com/Product/TestEquipment/Thermo-Anemometers/) - [Thermo-Hygrometers](https://www.dwyer-inst.com/Product/TestEquipment/Thermo-Hygrometers/) - [Thickness Gage, Ultrasonic](https://www.dwyer-inst.com/Product/TestEquipment/ThicknessGage-Ultrasonic/) - [Vane Thermo-Anemometer](https://www.dwyer-inst.com/Product/TestEquipment/VaneThermo-Anemometer/) - [Valves](https://www.dwyer-inst.com/Product/Valves/) - [Valves](https://www.dwyer-inst.com/Product/Valves/Valves/) - [Angle Seat](https://www.dwyer-inst.com/Product/Valves/Valves/AngleSeat/) - [Ball](https://www.dwyer-inst.com/Product/Valves/Valves/Ball/) - [Automated](https://www.dwyer-inst.com/Product/Valves/Valves/Ball/Automated/) - [Manual](https://www.dwyer-inst.com/Product/Valves/Valves/Ball/Manual/) - [Butterfly](https://www.dwyer-inst.com/Product/Valves/Valves/Butterfly/) - [Automated](https://www.dwyer-inst.com/Product/Valves/Valves/Butterfly/Automated/) - [Manual](https://www.dwyer-inst.com/Product/Valves/Valves/Butterfly/Manual/) - [Check](https://www.dwyer-inst.com/Product/Valves/Valves/Check/) - [Diaphragm Pulse](https://www.dwyer-inst.com/Product/Valves/Valves/DiaphragmPulse/) - [Globe](https://www.dwyer-inst.com/Product/Valves/Valves/Globe/) - [Manifold](https://www.dwyer-inst.com/Product/Valves/Valves/Manifold/) - [Needle](https://www.dwyer-inst.com/Product/Valves/Valves/Needle/) - [Self Acting Temperature Control](https://www.dwyer-inst.com/Product/Valves/Valves/SelfActingTemperatureControl/) - [Solenoid](https://www.dwyer-inst.com/Product/Valves/Valves/Solenoid/) - 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[Volume Booster](https://www.dwyer-inst.com/Product/Valves/VolumeBooster/) - [Miscellaneous](https://www.dwyer-inst.com/Product/Miscellaneous/) - [Accessories](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/) - [Air Filter Kits](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/AirFilterKits/) - [Carrying Cases](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/CarryingCases/) - [Cooling Extensions](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/CoolingExtensions/) - [Filters, Regulators and Lubricators](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/Filters-RegulatorsandLubricators/) - [Fittings, Filters & Mufflers](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/Fittings-Filters-Mufflers/) - [Fittings, Nylon](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/Fittings-Nylon/) - [Fittings, Stainless Steel](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/Fittings-StainlessSteel/) - [Gage Fluids](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/GageFluids/) - [Gage Guards/Pressure Snubbers](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/GageGuards-PressureSnubbers/) - [Mounting Options](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/MountingOptions/) - [Pneumatic Fittings](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/PneumaticFittings/) - [Pneumatic Valves](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/PneumaticValves/) - [Regulator Kit](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/RegulatorKit/) - [Siphons](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/Siphons/) - [Enclosures](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/Enclosures/) - [Thermocouple Wire](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/ThermocoupleWire/) - [Static Pressure Sensors](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/StaticPressureSensors/) - [Technical Reference Books](https://www.dwyer-inst.com/Product/Miscellaneous/Accessories/TechnicalReferenceBooks/) - 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