3 psi Pressure Gauges | McMaster-Carr

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System of Measurement

Pipe Size

Connection Location

Maximum Pressure

1,000 psi to 1,999.9 psi

2,000 psi to 9,999.9 psi

10,000 psi to 19,999.9 psi

20,000 psi or greater

Less than 10,000 kPa

10,000 kPa to 19,999 kPa

20,000 kPa to 29,999 kPa

30,000 kPa to 99,999 kPa

100,000 kPa or greater

For Use With

Pressure Numeric Increments

0.5 psi

Measurement Unit

Bar

Megapascals

Pounds per Square Inch

Graduations

Thread Type

Minimum Pressure

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Measures

Differential Pressure

Dial Diameter

Dial Type

Fitting Connection

Material

Connection Material

Case Material

Gender

Mounting Position

RoHS

REACH

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

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14 Products

About Pressure Gauges

Find a gauge with the right connection material and dial type—many with traceable calibration certificates.

High-Accuracy Low-Pressure Gauges

Measure small pressure changes in ventilation systems, hydraulic applications, and other critical processes with these high-accuracy gauges. Mount them with the dial face upright.

Painted Steel Case with Brass Connection—Single Scale (Pounds per Square Inch)


Bottom Connection	Center-Back Connection	Bottom Connection	Center-Back Connection

				Temp. Range, ° F					Bottom Connection		Center-Back Connection
	Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Pressure Range		Each		Each
Upright Mount







				NPT Male

				2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 3 psi	4026K16	000000	4026K37	000000




						NPT Male with Calibration Certificate Traceable to NIST

						2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 3 psi	4026K24	000000	4026K46	000000

304 Stainless Steel Case with Brass Connection—Single Scale (Pounds per Square Inch)


Bottom Connection	Bottom Connection

Gauges with 304 stainless steel case or polyester plastic case have better corrosion resistance than gauges with painted steel case.

			Temp. Range, ° F					Bottom Connection
	Dial Dia.	Pipe Size	Environment	Process	For Use With	Accuracy	Pressure Range		Each
Upright Mount







				NPT Male

				4"	1/4	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1% Full Scale (Grade 1A)	0 to 3 psi	4269K1	0000000

Low-Pressure Differential Gauges with Color Indicator

A band of green, yellow, and red provides a clear indication of changes in differential pressure. Gauges are commonly used to indicate clogged filters.

Glass-Filled Nylon Case with Anodized Aluminum Connections (Pounds per Square Inch)

Image of Product. Front orientation. Differential Pressure Gauges. Low-Pressure Differential Gauges with Color Indicator.

	Pressure Range, psi
	Green Band	Yellow Band	Red Band	Max. Pressure, psi	Environment Temp. Range, ° F	Process Temp. Range, ° F	Ht.	Wd.	Dp.	Case Color	For Use With	Accuracy		Each
1/4 NPT Female Threaded Pipe Connection



		0 to 3	3 to 4.5	4.5 to 5	300	-40 to 200	-40 to 200	3 1/4"	3 1/4"	1 1/2"	Black	Air, Water, Hydraulic Fluid, Carbon Dioxide, Nitrogen, Hydrogen, Argon, Acetylene	±5%	2238K22	0000000

High-Accuracy Digital Pressure Test Gauges

Not only do these gauges have an accuracy of ±0.25%, they also have a four-digit LCD display that allows for easy reading of measurements. Use them for testing, calibrating, laboratory applications, and other critical applications that require precision.

Aluminum Case with 316 Stainless Steel Connection—Battery Powered


	Bottom Connection

					Dial									Bottom Connection
	Pressure	Pressure Resolution, psi	Accuracy	Digit Ht.	Ht.	Wd.	Environment Temp. Range, ° F	Process Temp. Range, ° F	Enclosure Rating	Hazardous Location Rating	For Use With	Features	Batteries Included		Each
NPT Male







				1/4 Pipe Size

				0 psi to 3 psi 0 MPa to 1.4 MPa 0 bar to 1 bar	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	NEMA 2	—	Air, Hydraulic Fluid, Water	5-min. Automatic Shut-Off	Yes	3943K111	0000000


				0 psi to 3 psi 0 MPa to 1.4 MPa 0 bar to 1 bar	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	NEMA 2	Ex Ia IIC T4-T3; NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Zone 0 Groups IIC, IIB, IIA	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	5-min. Automatic Shut-Off	Yes	3943K311	000000


				NPT Male—Calibration Certificate Traceable to NIST







								1/4 Pipe Size

								0 psi to 3 psi 0 MPa to 1.4 MPa 0 bar to 1 bar	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	NEMA 2	—	Air, Hydraulic Fluid, Water	5-min. Automatic Shut-Off	Yes	3943K211	000000


								0 psi to 3 psi 0 MPa to 1.4 MPa 0 bar to 1 bar	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	NEMA 2	Ex Ia IIC T4-T3; NEC Class I Divisions 1, 2 Groups A, B, C, D; NEC Zone 0 Groups IIC, IIB, IIA	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	5-min. Automatic Shut-Off	Yes	3943K331	000000

Aluminum Case with 316 Stainless Steel Connection—Electric 8-24V AC, 9-32V DC


	Bottom Connection

					Dial							Bottom Connection
	Pressure	Pressure Resolution, psi	Accuracy	Digit Ht.	Ht.	Wd.	Environment Temp. Range, ° F	Process Temp. Range, ° F	Enclosure Rating	For Use With	Wire Connection		Each
NPT Male







				1/4 Pipe Size

				0 psi to 3 psi 0 MPa to 1.4 MPa 0 bar to 1 bar	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	NEMA 2	Air, Hydraulic Fluid, Water	Wire Leads	3943K141	0000000


				NPT Male—Calibration Certificate Traceable to NIST







								1/4 Pipe Size

								0 psi to 3 psi 0 MPa to 1.4 MPa 0 bar to 1 bar	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	NEMA 2	Air, Hydraulic Fluid, Water	Wire Leads	3943K231	000000

Powder-Coated Aluminum Case with 316 Stainless Steel Connection—Electric 4-20 mA Output Signal


	Bottom Connection

Gauges with 4-20mA output signal convert pressure to an electrical signal for remote monitoring.

					Dial									Bottom Connection
	Pressure, psi	Pressure Resolution, psi	Accuracy	Digit Ht.	Ht.	Wd.	Environment Temp. Range, ° F	Process Temp. Range, ° F	Case Color	Enclosure Rating	For Use With	Wire Connection	Input Voltage, V DC		Each
NPT Male







				1/4 Pipe Size

				0 to 3	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	Blue, White	NEMA 2	Air, Hydraulic Fluid, Water	Wire Leads	8 to 32	2821K121	0000000


				NPT Male—Calibration Certificate Traceable to NIST







								1/4 Pipe Size

								0 to 3	0.001	±0.25% Full Scale (Not Rated)	1/2"	2 7/8"	3 3/8"	0 to 185	-40 to 200	Blue, White	NEMA 2	Air, Hydraulic Fluid, Water	Wire Leads	8 to 32	2821K141	000000