{{#pushedProductsPlacement4.length}} {{#each pushedProductsPlacement4}}
{{product.defLight}}
{{#if company.requestButtonsVisibility.requestButtonQuestion == "ACTIVE"}}
{{elseif company.requestButtonsVisibility.requestButtonWhereToBuy == "ACTIVE"}}
{{/if}}
{{product.productLabel}}
{{product.model}}

{{#each product.specData:i}} {{name}}: {{value}} {{#i!=(product.specData.length-1)}}
{{/end}} {{/each}}

{{{product.idpText}}}

{{productPushLabel}}
{{#if product.newProduct}}
{{/if}} {{#if product.hasVideo}}
{{/if}}
{{/each}} {{/pushedProductsPlacement4.length}}
{{#pushedProductsPlacement5.length}} {{#each pushedProductsPlacement5}}
{{product.defLight}}
{{#if company.requestButtonsVisibility.requestButtonQuestion == "ACTIVE"}}
{{elseif company.requestButtonsVisibility.requestButtonWhereToBuy == "ACTIVE"}}
{{/if}}
{{product.productLabel}}
{{product.model}}

{{#each product.specData:i}} {{name}}: {{value}} {{#i!=(product.specData.length-1)}}
{{/end}} {{/each}}

{{{product.idpText}}}

{{productPushLabel}}
{{#if product.newProduct}}
{{/if}} {{#if product.hasVideo}}
{{/if}}
{{/each}} {{/pushedProductsPlacement5.length}}
ultrasonic flow meter / for liquids / clamp-on
ultrasonic flow meter
SITRANS FS230

Process temperature: -40 °C - 230 °C

The SITRANS FS230 digital clamp-on ultrasonic flowmeter is a process-optimizing solution for measuring flow in virtually any liquid application. Designed to provide both exceptional performance ...

See the other products
Siemens Process Instrumentation
ultrasonic flow meter / ultrasonic transit-time / for liquids / in-line
ultrasonic flow meter
SITRANS F US SONO 3300

Process pressure: 0 bar - 40 bar
Process temperature: -40 °C - 160 °C
Volumetric flow rate: 10 m³/h - 2200 m³/h

The SITRANS F US SONO3300/SITRANS FUS060 is a flowmeter manufactured by Siemen company It is applicable on oil and power engineering, cold- , hot- and waste water. It was packed with carbon steel that is fitted on the ...

See the other products
Siemens Process Instrumentation
ultrasonic flow meter / for liquids / flange
ultrasonic flow meter
SITRANS F US SONO 3100

Process pressure: 0 bar - 40 bar
Process temperature: -20 °C - 85 °C
Volumetric flow rate: 28 m³/h - 4200 m³/h

The SITRANS FUS SONO 3100/SITRANS FUS060 flowmeter is comprised of a SITRANS FUS SONO 3100 sensor and o-ring or spine transducers which relies upon the requisition. The standard rendition is conveyed as a 2-track sensor ...

See the other products
Siemens Process Instrumentation
ultrasonic flow meter / for water / with battery / in-line
ultrasonic flow meter
SITRANS FUS380

Process pressure: 0 bar - 40 bar
Process temperature: 0 °C - 200 °C
Volumetric flow rate: 15 m³/h - 3600 m³/h

SITRANS FUS380 represents a a battery or mains supply powered 2-track flowmeter designed to suit versatile applications and almost all utility applications for water flow monitoring. SITRANS FUS380 with ...

See the other products
Siemens Process Instrumentation
ultrasonic flow meter / for liquids / in-line
ultrasonic flow meter
SITRANS FUE380

Process pressure: 0 bar - 40 bar
Process temperature: 0 °C - 200 °C
Volumetric flow rate: 15 m³/h - 36000 m³/h

... , it can be sealed for use in many countries. Various diagnostic information and measurement values are displayed on the indicator that is featured with this unit. Valid approvals for energy metering include OIML R75, ...

See the other products
Siemens Process Instrumentation
ultrasonic flow meter / for liquids / digital display / IP67
ultrasonic flow meter
ES-FLOW series

Process pressure: 0 bar - 100 bar
Process temperature: 10 °C - 60 °C
Volumetric flow rate: 0 l/min - 1.5 l/min

The new ES-FLOWUltrasonic Flow Meter was designed to measure tiny volume flows from 4 up to 1500 ml/min with high precision, high linearity and low pressure drop, using ...

ultrasonic flow meter / for liquids / in-line
ultrasonic flow meter
SONIC-VIEW series

Process pressure: 16 bar
Process temperature: 5 °C - 60 °C
Volumetric flow rate: 1.5 l/min - 110 l/min

The small-scale and solid state ultrasonic flow meter is ideal for measuring water and aqueous solutions. This non-obstructive flow meter functions by means of two ultrasonic ...

ultrasonic flow meter / Doppler ultrasonic / for liquids / digital
ultrasonic flow meter
DFM 5.1

Process pressure: 0 psi - 10 psi
Process temperature: -40 °C - 150 °C

Greyline DFM 5.1 doppler flow meter is a latest innovation in ultrasonic metering. It provides flow measurement from outside of a pipe. It features the most advanced technology in Doppler ...

See the other products
Greyline Instruments
ultrasonic flow meter / Doppler ultrasonic / for liquids / rugged
ultrasonic flow meter
PDFM 5.1

Process pressure: 0 bar - 0.69 bar
Process temperature: -40 °C - 150 °C

... out noise and produce flow measurement accuracy far greater than previously possible. Mount the ultrasonic sensor on the outside of a pipe and this new PDFM 5.1 Portable Doppler Flow Meter ...

See the other products
Greyline Instruments
ultrasonic flow meter / ultrasonic transit-time / for water / portable
ultrasonic flow meter
PTFM 1.0

Process temperature: -40 °C - 150 °C

... Portable Transit Time Flow Meter operates by measuring the “transit time” or “time of flight” for ultrasonic sound pulses transmitted from one transducer to another. To measure flow the ...

See the other products
Greyline Instruments
ultrasonic flow meter / ultrasonic transit-time / for liquids / with battery
ultrasonic flow meter
PT400

Process temperature: -20 °C - 135 °C

... portable transit time flow meter, ideally suited for accurate flow measurements from outside the pipe and intended for use with clean fluids like water, glycol, oil and most chemicals. ...

See the other products
Greyline Instruments
ultrasonic flow meter / for water / for liquids / digital
ultrasonic flow meter
TTFM 1.0

Process pressure: 0 psi - 10 psi
Process temperature: -40 °C - 150 °C

... contacting ultrasonic flow-meter, which facilitates accurate flow measurement, from outside of plastic or metal pipes. Greyline TTFM 1.0 Transit Time Flow ...

See the other products
Greyline Instruments
ultrasonic flow meter / for liquids / chemical-resistant
ultrasonic flow meter
DulcoFlow®

Process pressure: 3 bar - 16 bar
Process temperature: -10 °C - 45 °C
Volumetric flow rate: 0 l/h - 50 l/h

The DulcoFlow® flow meter is a measuring instrument that works based on ultrasonic measurement process. The medium connecting parts are made out of chemical proof PVDF. Advancing medium can be measured ...

ultrasonic flow meter / for oil / for water / with pulse output
ultrasonic flow meter
SU series

Volumetric flow rate: 50 l/min - 200 l/min

The SU type ultrasonic flow rate sensor with robot inline design are used to monitor volumetric flow rates, temperature of the medium and offers suitability in water, oil and glycol ...

ultrasonic flow meter / for liquids / for water / compact
ultrasonic flow meter
SVM-110

Process pressure: 16 bar
Process temperature: 5 °C - 60 °C
Volumetric flow rate: 5 l/min - 110 l/min

... replace the flow sensors with moving parts which may not be suitable for certain applications. There is huge independence available for outlet and inlet pipes for enabling installation on compact machines with confines ...

ultrasonic flow meter / for liquids / for water / compact
ultrasonic flow meter
SVM-030

Process pressure: 16 bar
Process temperature: 5 °C - 60 °C
Volumetric flow rate: 1.5 l/min - 30 l/min

Make liquid flows visible by: - Pulse / frequency output - Analog output (4 .. 20 mA) - Blinking LED (red/green) No mechanical wear No moving parts Just one chemically resistant wetted part (stainless steel) Alarm output, ...

Doppler ultrasonic flow meter / for water / digital display / economical
Doppler ultrasonic flow meter
FDT500

Process pressure: 0 Pa - 1586000 Pa
Process temperature: 0 °C - 50 °C

Economical Ultrasonic Flow Meter for Water Service DN 32 to 200 (2 to 8") Flanges Battery Powered Displays Flow Rate and Total Extended Low Flow Range Virtually ...

ultrasonic flow meter / for liquids / with analog output / with LCD display
ultrasonic flow meter
FDT7000

Process temperature: 0 °C - 50 °C
Volumetric flow rate: 0.4 l/min - 25400 l/min

... DIN 300 Local Display of Flow Rate and Total 4 to 20 mA Retransmission of Flow Rate RS485 Communications (Modbus®) For Most Clean Liquids IP54 Rated Enclosure (NEMA 3) Description The FDT7000 Series ...

ultrasonic flow meter / for liquids / digital display / metal tube
ultrasonic flow meter
OPTISONIC 6300 P

Process temperature: -40 °C - 120 °C

... Applications • Commissioning of HVAC systems • Checking of inline flowmeters • Checking of pump performance • Temporary replacement of defective flowmeters • General flow related ...

See the other products
KROHNE Messtechnik
ultrasonic flow meter / for liquids / in-line
ultrasonic flow meter
UFM 3030

Process pressure: 0 bar - 40 bar
Process temperature: 0 °C - 180 °C
Volumetric flow rate: 0 m³/h - 30000 m³/h

... Optional pressure and temperature inputs for calculation of standardised volumetric flow or mass flow according to API 2540 or customer specifics • Over 20.000 ultrasonic flowmeters ...

See the other products
KROHNE Messtechnik
ultrasonic flow meter / for liquids / for high temperatures / in-line
ultrasonic flow meter
UFM 530 HT

Process pressure: 40, 10, 16 bar
Process temperature: 0 °C - 500 °C

UFM 530 HT is a dual beam ultrasonic flow meter for crudes and a broad range of refined products, that are processed under extreme conditions (high temperature / high pressure). Also for accurate flow ...

See the other products
KROHNE Messtechnik
ultrasonic flow meter / for liquids / economical / in-line
ultrasonic flow meter
ALTOSONIC III

Process temperature: -25 °C - 500 °C

... effective alternative for conventional flowmeters like turbines or PD meters • Large dynamic range • Light weight and compact to build-in • Bi-directional flow measurement • Easy ...

See the other products
KROHNE Messtechnik
ultrasonic flowmeter / for liquids / for custody transfer
ultrasonic flowmeter
ALTOSONIC 5

Process pressure: 19 bar - 102.1 bar
Process temperature: -40 °C - 120 °C

ALTOSONIC 5 is an ultrasonic liquid flowmeter for custody transfer metering in upstream and midstream applications in the Oil & Gas industry. Benefits • Significant easier small volume proving • ...

See the other products
KROHNE Messtechnik
ultrasonic flow meter / for liquids / clamp-on / stainless steel
ultrasonic flow meter
US300FM

Process temperature: -30 °C - 200 °C

US300FM ultrasonic flowmeter designed with a blend of advanced signal processing and correlation detection method, provides fast, accurate, and no-zero offset flow measurements in clean ...

ultrasonic flow meter / for liquids / portable / in-line
ultrasonic flow meter
US300PM

Process temperature: -30 °C - 200 °C

The model US300PM is a movable ultrasonic flow meter used for measuring liquid in a filled pipe. With an innovation signal processing and correlation detection system that provides quick, accurate, and ...

ultrasonic flow meter / for gas / with display / loop-powered
ultrasonic flow meter
Proline Prosonic Flow B 200

Process pressure: 0 Pa - 1100000 Pa
Process temperature: 0 °C - 80 °C

Prosonic Flow B 200 is the specialist for accurate and reliable measurement of wet biogas and digester gas,even under fluctuating process conditions. With its unique integrated real-time methane fraction analysis, Prosonic ...

ultrasonic flow meter / for liquids / for chemicals / with display
ultrasonic flow meter
Proline Prosonic Flow 92F

Process pressure: 40 bar
Process temperature: -40 °C - 200 °C
Volumetric flow rate: 0 m³/h - 2400 m³/h

The Prosonic 92F combines a loop-powered transmitter with an inline sensor in a rugged industrial design. It offers easy system integration and accuracy at an attractive price. Prosonic 92F is ideally suited for the chemical and petrochemical ...

ultrasonic flow meter / for liquids / with analog output / with digital output
ultrasonic flow meter
Proline Prosonic Flow 93P

Process temperature: -40 °C - 170 °C
Volumetric flow rate: 0 m³/h - 452389 m³/h

The Prosonic Flow P clamp-on sensor was specially designed for the process industry. Combined with the Prosonic Flow 93 transmitter with touch control, four line display and extended functionality Prosonic ...

ultrasonic flow meter / for liquids / bi-directional / high-accuracy
ultrasonic flow meter
Time DELTA C étendu

Process temperature: -20 °C - 80 °C

This clamp-on type portable ultrasonic flowmeter consists of a detector clamped on the pipe (DN13 to 6000 mm depending on detectors) and of a and of a digital converter mounted remotely. It can measure ...

ultrasonic flow meter / for liquids / compact / 4-20 mA
ultrasonic flow meter
M-flow PW

This ultrasonic portable flowmeter consists of a detector clamped on the pipe (DN25 to 1200 mm depending on detectors) and of a and of a digital converter mounted remotely. It can measure bi-directional ...

ultrasonic flow meter / Doppler ultrasonic / for liquids / for water
ultrasonic flow meter
PORTAFLOW-C

Process temperature: -40 °C - 200 °C

Portable ultrasonic flowmeter PORTAFLOW-C This ultrasonic portable flowmeter consists of two sensors clamped on the pipe (DN 13 to 6000 mm, according to sensors) and ...

ultrasonic flow meter / for liquids / economical / clamp-on
ultrasonic flow meter
Time DELTA-C

Process temperature: -20 °C - 80 °C

Clamp-on portable ultrasonic flowmeter consists of a detector clamped on the pipe (DN13 to 6000 mm depending on detectors) and of a and of a digital converter mounted remotely. High accuracy: ±1,0% ...

ultrasonic flow meter / for liquids / precision / IP66
ultrasonic flow meter
FST

Process temperature: -40 °C - 150 °C

SPOOL PIECE ULTRASONIC FLOWMETER FOR LIQUIDS High accuracy for a wide range of applications Accuracy : +/- 0.2% of rate Easy-to-operate Low maintenance Accurate measurement for various liquid ...

ultrasonic flow meter / radar / for wastewater / 4-20 mA
ultrasonic flow meter

Process temperature: -20 °C - 70 °C

Hybrid Flow Metering NIVUS combine Radar Technology and Ultrasonic Technology in one single Transmitter Introducing the new NivuFlow 7550 the measurement systems manufacturer from now on provides a ...

See the other products
NIVUS GmbH
ultrasonic flow meter / Doppler ultrasonic / for liquids / clamp-on
ultrasonic flow meter
OCM FR

Process temperature: -30 °C - 70 °C

NIVUS Full Pipe Quick Retrofitting for high accurate Flow Measurement NFP (NIVUS Full Pipe) flow meter was developed particularly for flow measurement in full pipes from DN 100 to DN ...

See the other products
NIVUS GmbH
ultrasonic flow meter / Doppler ultrasonic / for liquids / open-channel
ultrasonic flow meter
OCM F

Process temperature: -30 °C - 70 °C

The OCM F flow metering system is made by using the latest 4th gen technology & intelligent Doppler technology using full bi-directional ultrasonic velocity sensor . Apt for all channel shapes. Can ...

See the other products
NIVUS GmbH
ultrasonic flow meter / Doppler ultrasonic / for liquids / open-channel
ultrasonic flow meter
NivuLog SunFlow

Process temperature: -40 °C - 85 °C

The Nivulog SunFlow is a solar-powered flow measurement station from Nivus that is independent from the main power. It has a reliable doppler flow meter that is engineered to provide constant flow ...

See the other products
NIVUS GmbH
ultrasonic flow meter / Doppler ultrasonic / for liquids / clamp-on
ultrasonic flow meter
PCM F

Process temperature: -30 °C - 70 °C

The PCM F is an ultrasonic Doppler flow meter for liquids. It is equipped with batteries that can last long because of its maximized energy saving process flow. Different types of peripheral ...

See the other products
NIVUS GmbH
ultrasonic flow meter / for liquids / with display / electronic
ultrasonic flow meter
CU series

Process temperature: 0 °C - 80 °C

... protection installation, automotive industry and energy plants. Suitable for flow measurement of liquids such as sea water, kerosene, gas-oil, petrol, oils? Technical specifications Flow speed range: ...

ultrasonic flow meter / for water / for wastewater / with display
ultrasonic flow meter
FLUXUS F501

Process temperature: -40 °C - 100 °C

... for many flow metering applications found in the water and wastewater sector and adjacent industries. The FLUXUS F501 offers a precise bi-directional flow measurement over a wide turndown ratio - not ...

See the other products
FLEXIM
ultrasonic flow meter / for liquids / digital / precision
ultrasonic flow meter
FLUXUS F706

Process temperature: -40 °C - 200 °C

... advantages of non-invasive ultrasonic liquid flow measurement. With its 4 beams, in reflect mode providing 8 paths through the gaseous medium, the meter averages the result of up to ...

See the other products
FLEXIM
ultrasonic flow meter / mass / for liquids / digital
ultrasonic flow meter
FLUXUS F721

Process temperature: -40 °C - 200 °C

... technological breakthrough in the ultrasonic clamp-on volume and mass flow measurement of liquids. With its new hardware design and improved, powerful digital signal processing it surpasses any other ...

See the other products
FLEXIM
ultrasonic flow meter / mass / for liquids / digital
ultrasonic flow meter
FLUXUS F801

Process temperature: -40 °C - 600 °C

... be operated by a magnet pen without having to open the housing. The FLUXUS F801 flow meter allows for an inherently bi-directional flow measurement of volume and mass flow rates of nearly ...

See the other products
FLEXIM
ultrasonic flow meter / for liquids / digital display / bi-directional
ultrasonic flow meter
FLUXUS F809

Process temperature: -190 °C - 600 °C

The FLUXUS F809 is FLEXIM's dual channel ultrasonic clamp-on flow meter for bi-directional flow measurement of liquids in hazardous areas ( ATEX, IECEx Zone 1 and FM Class I, Div. 1 approved). With ...

See the other products
FLEXIM
ultrasonic flow meter / for water / open-channel / clamp-on
ultrasonic flow meter
deltawave

Deltawave is a precise flow meter for open channels, filles, and partially filled pipes, that even act as a temperature meter and a profile analysis tool. Deltawave is capable of working even under ...

ultrasonic flow meter / for liquids / clamp-on / industrial
ultrasonic flow meter
deltawaveC-F

Process temperature: -40 °C - 150 °C

... display is easy to interpret, even by users that do not have the required experience. The new quick setup option, allows setup of flow measurements in less than a minute. Online help texts makes the use of printed manual ...

ultrasonic flow meter / for liquids / portable / clamp-on
ultrasonic flow meter
deltawaveC-P

Process temperature: -40 °C - 150 °C

The DeltawaveC-P model assembled by Systec Controls, is a portable non-invasive clamp-on ultrasonic flow meter, intended for liquid applications. It is equipped with pipes that have 10~6000mm ...

ultrasonic transit-time flow meter / for water / digital display / open-channel
ultrasonic transit-time flow meter
RISONIC modular

Process temperature: -20 °C - 70 °C

The RISONIC modular Flow Meter features a high measuring accuracy and an easy operation. It also has a web interface and shows channel as well as pipe measurements. It functions with a multi-section and multi-pipe total ...

ultrasonic flow meter / for liquids / loop-powered / clamp-on
ultrasonic flow meter
LPU-2127

Process temperature: -40 °C - 60 °C

The LPU-2127 is a non-contact, ultrasonic sensor used for measuring liquids in tanks up to 25 feet tall. This sensor was specially designed for easy setup with an integrated keypad and LCD display built into the unit. ...

positive displacement flow meter / ultrasonic / for gas / non-contact
positive displacement flow meter
D-FL 220

Process temperature: -20 °C - 300 °C

Suitability tested and certified ultrasonic measuring system to measure the velocity and the volume flow of flue gas or process gas in pipes or ducts, especially for wet and aggressive smoke emissions. - ...

ultrasonic flow meter / for water / open-channel
ultrasonic flow meter
FlowCERT Controller

Process temperature: -20 °C - 55 °C

Pulsar's FlowCERT system offers a complete solution to measure industry's highest accuracy non-contacting ultrasonic channel flows. The device is designed for flumes and weirs to provide temperature-independent, ...

ultrasonic flow meter / for liquids / open-channel
ultrasonic flow meter
FlowCERT Lite Controller

Process temperature: -20 °C - 50 °C

... FlowCERT Lite is a precise open channel flow measurement device. It is made compatible for flumes or wires. An easy installation is guaranteed through its use. It is constructed in compliance to the BS3680 open channel ...

ultrasonic flow meter / for solids / for liquids / dual-channel
ultrasonic flow meter
UltraTWIN Controller

Process temperature: -20 °C - 50 °C

The UltraTwin ultrasonic systems from Pulsar is made with 2 channels that are individually modifiable to operate as stand alone units as full flow monitors, or pump control and volume regulating systems. ...

ultrasonic flow monitor / for liquids / fixed / wall-mounted
ultrasonic flow monitor

Process temperature: -20 °C - 50 °C

... and the interface for the unit. The device comes with a typical capacity of 36 days flow logging at a 1 minute interval. An LCD display indicating flow rate and flow velocity is also incorporated.

ultrasonic flow meter / for liquids / open-channel / in-line
ultrasonic flow meter
Ultra Controllers

Process temperature: -20 °C - 50 °C

... Ultra series by Pulsar Process Measurement is an Ultrasonic open channel flow meter which composed of two different models. The ultra 3 and 5 are great tools designed for non-contacting open channel flow ...

ultrasonic flow meter / for liquids / with display / compact
ultrasonic flow meter

Process pressure: 40, 16 bar
Process temperature: 0 °C - 150 °C
Volumetric flow rate: 0.1 m³/h - 1250 m³/h

IFX-C MID Approved ultrasonic Flow meter for drinking water application. Operating principle based on transit time measurement. Single or dual beams. Flanged connections according to DIN or ANSI standard. Sizes ...

See the other products
Isoil Industria
ultrasonic flow meter / for liquids / energy meter
ultrasonic flow meter

Process pressure: 0 bar - 16 bar
Process temperature: -40 °C - 180 °C
Volumetric flow rate: 3.5 m³/h - 60 m³/h

ISOFLUX - Ultrasonic Heat Meters IFX serie 04 ISOFLUX, model IFX-Mx-04, is an energy meter and ultrasonic flow meter which can be used for the measurement ...

See the other products
Isoil Industria
ultrasonic flow meter / for liquids / for water / for chemicals
ultrasonic flow meter
IFX-F100

Process temperature: 0 °C - 200 °C

ISOFLUX ™ IFX-F100 Ultrasonic flow meter clamp-on type for fixed installation ISOFLUX ™ IFX-F100 Ultrasonic flow meter clamp-on type for fixed installation. Range ...

See the other products
Isoil Industria
ultrasonic flow meter / for liquids / portable / clamp-on
ultrasonic flow meter
IFX-P200

Process temperature: 0 °C - 200 °C

ISOFLUX ™ - IFX-P200 Portable flow meter clamp-on. Designed for quick checks of flow conditions in closed pipes in a non-intrusive way, using external probes "clamp-on" suitable for pipes of different ...

See the other products
Isoil Industria
ultrasonic flow meter / for liquids / flange
ultrasonic flow meter
IFX-A

Process pressure: 16, 40 bar
Process temperature: 0 °C - 150 °C
Volumetric flow rate: 0.2 m³/h - 2000 m³/h

The IFX-A is an ultra-sonic flow meter designed for clean water and lowly conductive materials. It operates based on measurement or transit time. It has 1 or 2 beams and connections with flanges in accordance ...

See the other products
Isoil Industria

How to choose this product

ultrasonic-flow-meter

An ultrasonic flow meter uses the propagation of sound waves in a moving fluid to determine flow rate by measuring the time required for the waves to traverse the fluid.

Applications

Such instruments are able to measure the flow of liquids and gases in a pipe.

Technologies

These devices consist of a pair of transducers which emit and receive ultrasonic impulses. Waves are emitted both with and against fluid flow. The difference in transit time of the upstream and downstream waves is proportional to the velocity of the fluid. Combined with pipe diameter, this information is used to calculate flow volume.

Meters can be placed within the pipe or clamped to its exterior surface. The latter arrangement is capable of measuring flow in pipes up to four meters in diameter.

How to choose

Choice will depend on the nature of the fluid, gas or liquid, its temperature, pressure and other characteristics. Other factors include the required degree of accuracy and whether an inserted or clamp-on model is more appropriate. Some are equipped with a digital display.