Magnetic-Field Meters | McMaster-Carr

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24 Products

High-Accuracy Flow and Temperature Transmitters

Also known as magmeters, these transmitters use a magnetic field to measure flow rate and temperature with high accuracy. Because they use a magnetic field, they only work with conductive liquids, such as water. These transmitters, also known as transducers, convert measurements to an electrical signal that can be interpreted by receiving devices, such as remote displays and programmable logic controllers (PLCs) to monitor flow or control equipment. For your receiving device to interpret the signal, you will need to calibrate it for the measurement range and output signal of the transmitter. As flow or temperature increases, the output signal increases. These transmitters have one analog output for flow and another for temperature. They only give accurate readings within the rated measurement range. A digital display makes it easy to view readings and adjust settings at the source. Mount these transmitters inline with your pipe system. They measure flow correctly in any mounting orientation.

These transmitters are calibrated with water. They can only be used with liquids with a conductivity of at least 20 µS/cm.

For the Manufacturer User Manual, click on a part number and select Product Detail.

			Flow Range
	Flow Measurement Type	Pipe Connections	Gallons per Minute, gpm	Liters per Minute, L/min	End-to-End Lg.	Accuracy	Max. Pressure @ Temp.	Temp. Range, ° F	Input Voltage Range, V DC	Mounting Position	Field Recalibratable	Enclosure Rating		Each
Two 4-20 mA Analog Transmitter Outputs—4-Pole M12 Connection Plugs







				316 Stainless Steel/Plastic/Polybutylene Body with 316 Stainless Steel Fitting

				Magnetic Induction	1/2 NPT Female	0.03 to 6.6	0.1 to 25	2 1/8"	±2%	225 psi @ 70° F	0 to 175	20 to 30	Any Angle	No	IP67	4397N101	0000000


				Magnetic Induction	3/4 NPT Female	0.02 to 13.22	0.2 to 50	2 1/8"	±2%	225 psi @ 70° F	0 to 175	20 to 30	Any Angle	No	IP67	4397N102	000000
				Magnetic Induction	1 NPT Female	0.1 to 26.4	0.2 to 100	2 1/8"	±2%	225 psi @ 70° F	0 to 175	20 to 30	Any Angle	No	IP67	4397N103	000000
				Magnetic Induction	1 1/2 NPT Female	1.3 to 79.3	5 to 300	6 11/16"	±0.8%	225 psi @ 70° F	0 to 175	20 to 30	Any Angle	No	IP65, IP67	4397N104	00000000
				Magnetic Induction	2 NPT Female	1.3 to 158.5	5 to 600	7 1/16"	±0.8%	225 psi @ 70° F	0 to 175	20 to 30	Any Angle	No	IP65, IP67	4397N105	00000000

Digital Magnetic Field Indicators

Measure magnetic fields to determine electromagnetic interference and detect flaws in welded metal.

Cannot Be Sold To—Product regulations restrict sales to the listed jurisdictions/areas.

Measurement Unit	Measuring Range (Increments)	Accuracy	Freq. Bandwith, kHz	Batteries Included	Includes	Cannot Be Sold To		Each
Amperes per Meter, Gauss, Teslas	0 G to 100 G (0.01 G) 0 kG to 1 kG (0.1 G) 0 kG to 10 kG (1 G) 0 kG to 45 kG (10 G)	±2%	0 to 5	Yes	AC Adapter, Detachable Probe	California	1488T56	000000000

Digital Electromagnetic Field Indicators

Measure the strength of magnetic fields, electric fields, and radio frequencies at the same time. To detect emissions, just point these meters at the electrical equipment you want to test, such as a cable. When they detect high levels that could damage sensitive equipment, an alert appears in red and an audible alarm sounds. Their color LCD display shows readings, bar graphs, and trending graphs. These indicators store up to 20 radio frequency readings.

Measurement Unit	Measures	Measuring Range (Increments)	Accuracy	Frequency Bandwith	Ht.	Wd.	Dp.	Batteries Included		Each
Gauss, Teslas	Magnetic Field Strength Electric Field Strength Radio Frequency Strength Magnetic Field Direction (3-Axis)	0.02 G to 2 G (0.01 G) 50 V/m to 2,000 V/m (1 V/m) 0.03 V/m to 14.46 V/m (0.02 V/m)	±15% ±7% ±2 dB	0.05 kHz to 0.06 kHz 0.05 kHz to 0.06 kHz 50,000 kHz to 3,500,000 kHz	4 1/2"	2 1/2"	1"	Yes	7401N11	0000000

Paper Magnetic Polarity Testers

Press onto your magnet and pole locations show up as dark green. Each sheet can be used multiple times.

Lg.	Wd.	Thk.	Pkg. Qty.		Pkg.
3"	3"	0.005"	3	5702K21	000000
6"	6"	0.005"	2	5702K24	00000
12"	12"	0.005"	1	5702K22	000000
36"	18"	0.005"	1	5702K23	000000

Calibrated-Dial Magnetic Field Indicators


	Protective Case

Calibrated at 72° F. In addition to measuring the strength of a magnetic field in gauss, these indicators also measure the direction of a magnetic field in positive/negative. To take a measurement, place the lower edge of the indicator near or against your tools and parts.

Indicators						Protective Cases
	Dial
Magnetic Field Measuring Range	Dia.	Face Color	Housing Material		Each		Each
5-0-5 Gauss	2 1/2"	White	Aluminum	8450T31	0000000	8450T32	000000
10-0-10 Gauss	2 1/2"	White	Aluminum	8450T14	000000	8450T32	00000
20-0-20 Gauss	2 1/2"	White	Aluminum	8450T16	000000	8450T32	00000
50-0-50 Gauss	2 1/2"	White	Aluminum	8450T18	000000	8450T32	00000

Dial Magnetic Field Indicators

Place the lower edge of these dial indicators near or against your tools and parts to measure the strength of a magnetic field in gauss.

	Dial
Magnetic Field Measuring Range	Dia.	Face Color	Housing Material		Each
10-0-10 Gauss	2"	White	Plastic	8575T11	0000000

Magnetic Field Detectors

Troubleshoot solenoid valves, check relays, and test permanent magnets by detecting if a magnetic field is present. Hold these detectors near a surface and they'll light up blue if they sense a magnetic field. They don't measure the strength or direction of the magnetic field.

Detects	Lg.	Wd.	Batteries Included	Features		Each
Magnetic Fields	6 1/4"	1"	Yes	Flashlight, Low Battery Indicator	7246N11	000000

Electronic Polarity Testers

Point this detector at your magnet and press the button. Red and green lights indicate north or south poles.

Lg.	Wd.	Batteries Included		Each
5 1/2"	1"	Yes	57255K71	000000

Motion-Measuring Modules for Development Boards

Measure your device's acceleration, rotation, or orientation. These modules gather data over time and track movement, which can help improve performance, debug issues, and calibrate your components. Solder them onto a development board. To connect them to your device, solder on a wire or header. For a solderless connection, use a Qwiic cord (not included).

For the Manufacturer User Manual, click on a part number and select Product Detail.

Modules with Magnetometer

A magnetometer measures your device's orientation.

		Output Data
	Magnetic Field Measuring, G	Resolution, bit	Freq., kHz	Measures	Temp. Range, ° F	Input Voltage, V DC	I2C Address	Connection Method	No. of Qwiic Connections	Lg.	Wd.		Each
I²C Communication Protocol—Qwiic Connection



		0 to 8	18	1	Magnetic Field Strength	-40 to 220	2.8 to 3.6	0x30	Solder	1	3/4"	5/16"	8184N14	000000

Modules with Accelerometer, Gyroscope, Magnetometer

A gyroscope measures how fast your device is rotating.

A magnetometer measures your device's orientation.

An accelerometer measures the rate at which your device is speeding up or slowing down.

				Output Data
	Accel., g	Velocity	Magnetic Field Measuring, G	Resolution, bit	Freq., kHz	Measures	Temp. Range, ° F	Input Voltage, V DC	I2C Address	Connection Method	No. of Qwiic Connections	Lg.	Wd.		Each
I²C Communication Protocol—Qwiic Connection



		2 4 8 16	125 °/s 250 °/s 500 °/s 1,000 °/s 2,000 °/s 4,000 °/s	0 to 8	18	1	Acceleration, Angular Velocity, Magnetic Field Strength	-40 to 220	1.71 to 3.6	0x6A 0x6B 0x30	Solder	2	1"	1"	8184N13	000000

Calibrated-Dial Magnetic Field Indicators with Certificate of Calibration


	Protective Case

These indicators come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. All are calibrated at 72° F. In addition to measuring the strength of a magnetic field in gauss, they also measure the direction of a magnetic field in positive/negative. To take a measurement, place the lower edge of the indicator near or against your tools and parts.

Indicators						Protective Cases
	Dial
Magnetic Field Measuring Range	Dia.	Face Color	Housing Material		Each		Each
10-0-10 Gauss	2 1/2"	White	Aluminum	8450T21	0000000	8450T32	000000
20-0-20 Gauss	2 1/2"	White	Aluminum	8450T22	000000	8450T32	00000
50-0-50 Gauss	2 1/2"	White	Aluminum	8450T23	000000	8450T32	00000