Differential Pressure Gauges

	Scale Scale

in. of H2O

psi

kPa

bar

in. of Hg

mbar

	For Use With For Use With

	Display Type Display Type

	Maximum Pressure Maximum Pressure

	Measures Measures

Differential Pressure

	Pipe Size Pipe Size

1/8

1/4

	Connection Style Connection Style

	Connection Type Connection Type


Pipe	Tube

	Dial Diameter Dial Diameter

2 1/2"

4 1/2"

	Connection Material Connection Material

	Case Material Case Material

Aluminum

Plastic

Stainless Steel

	Maximum Pressure, psi Maximum Pressure, psi

	Lens Material Lens Material

Plastic

Glass

	Minimum Process Temperature Minimum Process Temperature

	Minimum Pressure , psi Minimum Pressure , psi

	Maximum Process Temperature Maximum Process Temperature

	Maximum Environment Temperature Maximum Environment Temperature

	Minimum Environment Temperature Minimum Environment Temperature

	Gender Gender

Female

Male

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Pressure, in. of H2O Maximum Pressure, in. of H2O

	Width Width

2 13/16"

3 1/4"

7 1/2"

	For Tube ID For Tube ID

View catalog pages (2)

Forward

How can we improve?

71 Products

About Pressure Gauges

Measure small changes in air pressure with these gauges. They are commonly used to indicate clogged filters and to monitor fans and blowers.

Service these gauges without removing them using air filter kits. Kits include two vent valves for releasing air.

Surface mounting brackets allow gauges to be quickly installed on any flat surface. L mounting brackets can be carried to wherever you need to take a pressure reading. They can stand alone or be hung. Wraparound mounting brackets make it easy to service tubing, and don’t require cutting a hole in the wall.

For technical drawings and 3-D models, click on a part number.

Aluminum Case with Aluminum Connections—Single Scale (in. of H₂O)

For Use With: Air
Accuracy: ±2% Full Scale (Not Graded); except
0" to 0.25" in. of H₂O: ±4% Full Scale (Not Graded)
0" to 0.5" in. of H₂O: ±3% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, in. of H₂O	Graduation Marks, in. of H₂O	Numeric Increments, in. of H₂O
0 to 0.25	0.005	0.05
0 to 0.5	0.01	0.1
0 to 1	0.02	0.2
0 to 2	0.05	0.25
0 to 3	0.1	1
0 to 4	0.1	1
0 to 5	0.1	1
0 to 6	0.2	1
0 to 8	0.2	2
0 to 10	0.2	2
0 to 15	0.5	5
0 to 20	0.5	5
0 to 25	0.5	5
0 to 30	1	10
0 to 40	1	5
0 to 50	1	10
0 to 80	2	20
0 to 100	2	20
0 to 150	5	50

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Features	Includes		Each
4"	1/8	15	20° to 140°	20° to 140°	Two Inlets and Two Outlets	Plugs for Unused Ports	0000000	000000
NPT Female with NIST Certificate
4"	1/8	15	20° to 140°	20° to 140°	Two Inlets and Two Outlets	Plugs for Unused Ports	0000000	000000

Accessory Kits

Accessory Kit

Includes		Each
9-ft. Lg. × 3/16" ID Tubing Carrying Case Mounting Bracket Two Pipe-to-Tube Adapters	0000000	000000

Optional Air Filter Kits

Air Filter Kit

Includes		Each
Mounting Bracket Mounting Fasteners Two 5-ft. Lg. Aluminum Tubing Two Pressure Tips Two Vent Valves	0000000	000000

Optional Installation Kits

Installation Kit

Includes		Each
7-ft. Lg. PVC Tubing Two Pressure Tips	0000000	00000

Optional Mounting Brackets

Surface Bracket

L Bracket

Wraparound Bracket

Bracket Type	Length	Width	Height	Mounting Hole Diameter	Mounting Fasteners Included		Each
Surface	4 13/16"	4 13/16"	__	3/16"	No	0000000	00000
L	2 1/4"	4 5/16"	5 3/8"	3/16"	No	0000000	00000
Wraparound	6 5/16"	7 11/16"	4"	3/16"	No	0000000	00000

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.

For technical drawings and 3-D models, click on a part number.

Low-Pressure Differential Gauges with Color Indicator

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, Nitrogen, Hydrogen, Argon, and Acetylene
Accuracy: ±5% Full Scale (Not Graded)

	Pressure Range, psi
Pipe Size	Green Band	Yellow Band	Red Band	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Ht.	Wd.	Dp.	Case Color		Each
NPT Female
1/4	0-2	2-2.5	2.5-3.5	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	000000
1/4	0-3	3-4.5	4.5-5	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-6	6-9	9-12	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-7.5	7.5-12	12-15	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-13	13-20	20-30	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000
1/4	0-19.5	19.5-29.5	29.5-43	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	00000

Low-Pressure Differential Gauges with Digital Display

Measure small changes in air pressure with these hand-held gauges. They have a four-digit LCD display for easy reading of measurements. Gauges are commonly used to indicate clogged filters and to monitor fans and blowers.

Aluminum Case with Nickel-Plated Brass Connection—(psi, bar)

For Use With: Air, Natural Gas
Accuracy: ±0.5% Full Scale (Not Graded)

Pressure Range
psi	bar	Resolution, psi	Max. Pressure, psi	For Tube ID	Environment Temp. Range, °F	Process Temp. Range, °F	Digit Ht.	Ht.	Wd.	Batteries Included	Environmental Rating		Each
Barbed Tube Connection
0-30	0-2.069	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	6 1/2"	2 13/16"	Yes	NEC Class I Division 2 Groups A, B, C, D	0000000	0000000
Barbed Tube Connection with Calibration Certificate Traceable to NIST
0-30	0-2.069	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	6 1/2"	2 13/16"	Yes	NEC Class I Division 2 Groups A, B, C, D	0000000	000000

Optional Nylon Carrying Case

0000000

Each

000000

Aluminum Case with Nickel-Plated Brass Connection—(kPa, in. of H₂O)

For Use With: Air, Natural Gas
Accuracy: ±0.5% Full Scale (Not Graded)

Pressure Range
kPa	in. of H₂O	Resolution, in. of H₂O	Max. Pressure, psi	For Tube ID	Environment Temp. Range, °F	Process Temp. Range, °F	Digit Ht.	Ht.	Wd.	Batteries Included	Environmental Rating		Each
Barbed Tube Connection
0-4.982	0-20	0.01	10	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	6 1/2"	2 13/16"	Yes	NEC Class I Division 2 Groups A, B, C, D	0000000	0000000
0-49.82	0-200	0.1	30	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	6 1/2"	2 13/16"	Yes	NEC Class I Division 2 Groups A, B, C, D	0000000	000000
Barbed Tube Connection with Calibration Certificate Traceable to NIST
0-4.982	0-20	0.01	10	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	6 1/2"	2 13/16"	Yes	NEC Class I Division 2 Groups A, B, C, D	0000000	000000
0-49.82	0-200	0.1	30	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	6 1/2"	2 13/16"	Yes	NEC Class I Division 2 Groups A, B, C, D	0000000	000000

Optional Nylon Carrying Case

0000000

Each

000000

Low-Pressure Differential Gauges with U-Tube

Also known as manometers, these gauges come with indicating liquid that moves up and down two columns—the difference in height between them is your pressure. They are commonly used to indicate clogged filters.

Magnet-mount gauges can be moved for use in multiple locations. Gauges with barbed tube connection have a flexible body that rolls up for storage or transport.

316 Stainless Steel Connection—(in. of H₂O)

For Use With: Acetylene, Air, Argon, Carbon Dioxide, and Steam
Accuracy: Not Rated (Not Graded)

						Environment Temp. Range		Process Temp. Range				Mounting
Pressure Range, in. of H₂O	Scale Range, in. of H₂O	Numeric Increments, in. of H₂O	Graduation Marks, in. of H₂O	Max. Pressure, psi	Ht.	Min., °F	Max., °F	Min., °F	Max., °F	Gender	Mount Type	Fasteners Included	Hole Dia.	Number of Holes		Each
With 1/4 NPT Female Threaded Pipe Connection
0-10	5-0-5	1	0.1	250	14"	35°	150°	35°	250°	Female	Screw On	No	3/16"	4	0000000	0000000
0-15	7-0-7	1	0.1	250	18"	35°	150°	35°	250°	Female	Screw On	No	3/16"	4	0000000	000000

Nylon Plastic Connection—(in. of H₂O)

For Use With: Air, Argon, Carbon Dioxide, and Hydrogen
Accuracy: Not Rated (Not Graded)

With Barbed Tube Connection for 3/16" Tube ID
Pressure Range, in. of H₂O	Scale Range, in. of H₂O	Numeric Increments, in. of H₂O	Graduation Marks, in. of H₂O	Max. Pressure	Ht.	Max. Process Temp., °F	Gender	Mount Type		Each
0-8	4-0-4	1	0.1	Not Rated	17"	130°	Male	Magnet	0000000	0000000
0-12	6-0-6	1	0.1	Not Rated	21"	130°	Male	Magnet	0000000	000000
0-16	8-0-8	1	0.1	Not Rated	25"	130°	Male	Magnet	0000000	000000
0-24	12-0-12	1	0.1	Not Rated	33"	130°	Male	Magnet	0000000	000000
0-30	15-0-15	1	0.1	Not Rated	39"	130°	Male	Magnet	0000000	000000
0-36	18-0-18	1	0.1	Not Rated	45"	130°	Male	Magnet	0000000	000000
0-48	24-0-24	1	0.1	Not Rated	57"	130°	Male	Magnet	0000000	000000
0-60	30-0-30	1	0.1	Not Rated	69"	130°	Male	Magnet	0000000	000000
0-72	36-0-36	1	0.1	Not Rated	81"	130°	Male	Magnet	0000000	000000

Brass Connection—(in. of H₂O)

For Use With: Air, Argon, Carbon Dioxide, and Hydrogen
Accuracy: Not Rated (Not Graded)

With Compression Tube Connection for 1/4" Tube OD
Pressure Range, in. of H₂O	Scale Range, in. of H₂O	Numeric Increments, in. of H₂O	Graduation Marks, in. of H₂O	Max. Pressure, psi	Ht.	Gender	Mount Type		Each
0-8	4-0-4	1	0.1	100	20"	Female	Magnet	0000000	0000000
0-12	6-0-6	1	0.1	100	25"	Female	Magnet	0000000	000000
0-16	8-0-8	1	0.1	100	30"	Female	Magnet	0000000	000000
0-20	10-0-10	1	0.1	100	34"	Female	Magnet	0000000	000000
0-24	12-0-12	1	0.1	100	39"	Female	Magnet	0000000	000000
0-36	18-0-18	1	0.1	100	58"	Female	Magnet	0000000	000000

Liquid for Low-Pressure Differential Gauges with U-Tube

Refill U-tube gauges.

Concentrated solutions should be diluted with distilled water prior to use.

Ready To Use
Container Size, oz.	Specific Gravity	Temperature Range, °F	Color		Each
1	0.826	-20° to 140°	Red	000000	000000
1	1.91	35° to 140°	Blue	0000000	000000
4	1	Not Rated	Purple	0000000	000000
16	0.826	-40° to 160°	Red	0000000	00000
Concentrate
1	1	35° to 140°	Green	0000000	00000
15	1	35° to 125°	Green	0000000	00000

Low-Pressure Differential Gauges with Inclined Scale

Easier to read than U-tube gauges, these use an inclined scale to measure pressure or velocity in air applications. Gauges are also known as manometers.

Polycarbonate Plastic Connection—(in. of H₂O)

For Use With: Air
Accuracy: ±3% Full Scale (Not Graded)

				Indicating Liquid
Pressure Range, in. of H₂O	Max. Pressure, psi	Max. Process Temp. Range, °F	Ht.	Color	Specific Gravity	Mount Type	Mounting Fasteners Included	Includes		Each
With Barbed Tube Connection for 3/16" Tube ID
0-3	10	140°	6"	Red	0.826	Screw On	Yes	8-ft. Lg. Tubing; Indicating Liquid	000000	000000
0-7	10	140°	6"	Blue	1.91	Screw On	Yes	8-ft. Lg. Tubing; Indicating Liquid	000000	000000

High-Pressure Differential Gauges

These gauges are able to withstand line pressures up to 3,000 psi. They are commonly used to measure pressure differences in pumps and filters.

Gauges with 316 stainless steel case are more corrosion resistant than gauges with an aluminum case.

For technical drawings and 3-D models, click on a part number.

Aluminum Case with Aluminum Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, and Gasoline
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
2 1/2" Dial Diameter
0 to 10	0.5	2
0 to 15	1	3
0 to 20	1	5
0 to 25	1	5
0 to 30	2	10
0 to 40	2.5	10
0 to 50	2.5	10
0 to 100	5	20
4 1/2" Dial Diameter
0 to 10	0.5	2
0 to 15	0.5	3
0 to 20	1	5
0 to 25	1	5
0 to 30	1	10
0 to 40	2	10
0 to 50	2.5	10
0 to 100	5	20

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F		Each
2 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	0000000
4 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	000000

316 Stainless Steel Case with 316 Stainless Steel Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, and Gasoline
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
2 1/2" Dial Diameter
0 to 10	0.5	2
0 to 15	1	3
0 to 20	1	5
0 to 25	1	5
0 to 30	2	10
0 to 40	2.5	10
0 to 50	2.5	10
0 to 100	5	20
4 1/2" Dial Diameter
0 to 10	0.5	2
0 to 15	0.5	3
0 to 20	1	5
0 to 25	1	5
0 to 30	1	10
0 to 40	2	10
0 to 50	2.5	10
0 to 100	5	20

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F		Each
2 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	0000000
4 1/2"	1/4	3,000	0° to 150°	0° to 200°	000000	000000

Medium-Pressure Differential Gauges

Popular for use with natural gas, these gauges measure pressure differences in pipelines and filters with a maximum pressure of 1,500 psi.

Gauges with 316 stainless steel case are more corrosion resistant than gauges with an aluminum case.

For technical drawings and 3-D models, click on a part number.

Aluminum Case with Aluminum Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, Gasoline, and Natural Gas
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 2	0.1	0.5
0 to 5	0.25	1
0 to 10	0.5	2
0 to 15	1	3

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Specifications Met		Each
2 1/2"	1/4	1,500	0° to 150°	0° to 200°	CSA Certified	000000	0000000
4 1/2"	1/4	1,500	0° to 150°	0° to 200°	CSA Certified	000000	000000

316 Stainless Steel Case with 316 Stainless Steel Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, Gasoline, and Natural Gas
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 2	0.1	0.5
0 to 5	0.25	1
0 to 10	0.5	2
0 to 15	1	3

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Specifications Met		Each
2 1/2"	1/4	1,500	0° to 150°	0° to 200°	CSA Certified	000000	0000000
4 1/2"	1/4	1,500	0° to 150°	0° to 200°	CSA Certified	000000	000000

Differential Pressure and Vacuum Gauges

Commonly used to indicate clogged filters, these gauges display the difference between two pressure or vacuum measurements. They are also known as compound gauges.

For technical drawings and 3-D models, click on a part number.

Aluminum Case with Aluminum Connection—Single Scale (in. of H₂O)

For Use With: Air
Accuracy: ±2% Mid Scale (Not Graded); except
0 to 0.2" in. of H₂O: ±4% Mid Scale (Not Graded)
0 to 0.25" in. of H₂O: ±3% Mid Scale (Not Graded)

Available Pressure and Vacuum Ranges
Pressure Range, in. of H₂O	Vacuum Range, in. of H₂O	Graduation Marks, in. of H₂O	Numeric Increments, in. of H₂O
0 to 0.2"	-0.05" to 0	0.01	0.05
0 to 0.25"	-0.25" to 0	0.01	0.05
0 to 0.5"	-0.5" to 0	0.02	0.1
0 to 1"	-1" to 0	0.05	0.25
0 to 5"	-5" to 0	0.2	1
0 to 10"	-10" to 0	0.5	5
0 to 15"	-15" to 0	1	5

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Features	Includes		Each
4"	1/8	15	20° to 140°	20° to 140°	Two Inlets and Two Outlets	Plugs for Unused Ports	00000000	000000
NPT Female with NIST Certificate
4"	1/8	15	20° to 140°	20° to 140°	Two Inlets and Two Outlets	Plugs for Unused Ports	0000000	000000

Differential Pressure and Vacuum Gauges with Digital Display

Gauges have a four-digit LCD display for easy reading of measurements. Commonly used to indicate clogged filters, these gauges display the difference between two pressure or vacuum measurements. They are also known as compound gauges.

Aluminum Case with Brass Connection—(psi, kPa, in. of H₂O, in. of Hg, mbar)

For Use With: Air
Accuracy: ±0.5% Full Scale (Not Graded)

Pressure Range
psi	kPa	in. of H₂O	mbar	Vacuum Range, in. of Hg	Resolution, in. of H₂O	Max. Pressure, psi	For Tube ID	Environment Temp. Range, °F	Process Temp. Range, °F	Digit Ht.	Batteries Included	Features		Each
Barbed Tube Connection
0-0.723	0-4.982	0-20"	0-49.82	1.471"-0	0.01	10	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	0000000
0-7.225	0-49.82	0-200"	0-498.2	14.71"-0	0.1	30	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
0-20	0-137.9	0-553"	0-1,379	40.72"-0	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
Barbed Tube Connection with Calibration Certificate Traceable to NIST
0-0.723	0-4.982	0-20"	0-49.82	1.471"-0	0.01	10	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
0-7.225	0-49.82	0-200"	0-498.2	14.71"-0	0.1	30	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
0-20	0-137.9	0-553"	0-1,379	40.72"-0	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000

Air Sensors for Differential Pressure

Use these sensors with differential pressure gauges and switches to measure the static pressure drop across air filters, cooling coils, and blowers in air-handling equipment. Install them in duct through a hole and connect to your gauge with tubing.

Sensors with pressure tubes give more accurate measurements in applications with high air flow. Style D is held in place with a magnet so you can move it for use in multiple locations.

For technical drawings and 3-D models, click on a part number.

Style	For Tube ID	For Tube OD	Insertion Dp.	Tube Connection Type	Gender	Mount Type	Material	Features		Each
A	1/8"-3/16"	__	__	Barbed	Male	Screw On	Brass	__	0000000	00000
B	__	1/4"	__	Compression	Female	Screw On	Brass	__	0000000	0000
C	1/8"-3/16"	__	4"	Barbed	Male	Screw On	Brass	Pressure Tubes	0000000	00000
D	3/16"	__	3"	Barbed	Male	Magnetic	Brass	Pressure Tubes	0000000	00000
E	__	1/4"	4"	Compression	Female	Screw On	Brass	Pressure Tubes	0000000	00000

Air Sensors

Also known as pitot tubes, these can be used with manometers to measure air flow rate. Sensors have inch graduation marks so you can monitor your insertion depth.

For technical drawings and 3-D models, click on a part number.

For Tube ID	Insertion Dp.	OD	For Min. Duct Dia.	Tube Connection Type	Gender	Material		Each
1/4"	8 5/8"	5/16"	10"	Tube Stem	Male	304 Stainless Steel	0000000	0000000
1/4"	12 5/8"	5/16"	10"	Tube Stem	Male	304 Stainless Steel	0000000	000000
1/4"	18 5/8"	5/16"	10"	Tube Stem	Male	304 Stainless Steel	0000000	000000
1/4"	24 5/8"	5/16"	10"	Tube Stem	Male	304 Stainless Steel	0000000	000000

About Pressure Gauges

Low-Pressure Differential Gauges with Dial Indicator

Low-Pressure Differential Gauges with Color Indicator

Low-Pressure Differential Gauges with Digital Display

Low-Pressure Differential Gauges with U-Tube

Liquid for Low-Pressure Differential Gauges with U-Tube

Low-Pressure Differential Gauges with Inclined Scale

High-Pressure Differential Gauges

Medium-Pressure Differential Gauges

Differential Pressure and Vacuum Gauges

Differential Pressure and Vacuum Gauges with Digital Display

Air Sensors for Differential Pressure

Air Sensors