Test Instruments

Test instruments are essential tools for accurate diagnostics in the field, helping technicians and homeowners stay safe while fine-tuning equipment. Achieve precise measurements with top-quality products such as voltage testers, static pressure kits, water hardness test strips, infrared thermometers, and pocket-sized thermometers. Our instruments offer convenient features like data hold, auto power-off, integrated storage, circular laser targeting, and built-in work lights. Explore a wide selection of trusted brands, including UEi Test Instruments, MA-Line, and Klein Tools, available now at Jackson Systems & Supply for all your testing needs!

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Showing 289–336 of 497 resultsSorted by popularity

Photohelic Pressure Switch/Gage, -.25 to .25″ w.c., 4″ Dial

Dwyer

SKU: 3300MR-0
$764.48
MSRP: $879.15
You save 15%
Dwyer 3300MR-0 Photohelic Pressure Switch/Gage, -.25 to .25" w.c. quantity
Magnehelic Differential Pressure Gage, 2-0-2″ w.c. Zero Center Range

Dwyer

SKU: 2304
$114.70
MSRP: $131.91
You save 15%
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Magnehelic Differential Pressure Gage, 0-4.0″ w.c., 4″ Dial

Dwyer

SKU: 2004
$101.21
MSRP: $116.39
You save 15%
Dwyer 2004 Magnehelic Differential Pressure Gage, 0-4.0" w.c., 4" Dial quantity
Magnehelic Diff. Pressure Gage, .05-0-.2″ w.c., 4″ Dial

Dwyer

SKU: 2000-00N
$125.53
MSRP: $144.36
You save 15%
Dwyer 2000-00N Magnehelic Differential Pressure Gage, .05-0-.2" w.c. quantity
Magnehelic Differential Pressure Gage, 0–0.25″ w.c., 4″ Dial

Dwyer

SKU: 2000-00
$112.54
MSRP: $129.42
You save 15%
Dwyer 2000-00 Magnehelic Differential Pressure Gage, 0–0.25" w.c. quantity
Magnehelic Differential Pressure Gage, 0–0.50″ w.c. Range

Dwyer

SKU: 2000-0
$97.34
MSRP: $111.94
You save 15%
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Dual Range Flex Tube U-Inclined Manometer, 0-16″ & 0-2.6″ WC

Dwyer

SKU: 1227
$215.10
MSRP: $247.37
You save 15%
Dwyer 1227 Dual Range Flex Tube U-Inclined Manometer, 0-16" & 0-2.6" WC quantity
U-Tube Manometer, Oil Fill, 18-0-18″ w.c. Range

Dwyer

SKU: 1223-36-D
$235.96
MSRP: $271.35
You save 15%
Dwyer 1223-36-D U-Tube Manometer, Oil Fill, 18-0-18" w.c., SKU 1223-36-D quantity
Flex Tube U-Tube Manometer, 12″ w.c., 6-0-6″ w.c. Range

Dwyer

SKU: 1221-12-W/M
$85.84
MSRP: $98.72
You save 15%
Dwyer 1221-12-W/M Flex Tube U-Tube Manometer, 12" w.c. Range quantity
Gas Pressure Kit with Manometer, Carrying Case, Tubing & Fittings

Dwyer

SKU: 1212
$246.84
MSRP: $283.87
You save 15%
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Slack Tube Manometer, 18-0-18″ w.c., Rolls Up for Easy Storage

Dwyer

SKU: 1211-36
$223.90
MSRP: $257.49
You save 15%
Dwyer 1211-36 Slack Tube Manometer, 18-0-18" w.c., Rolls Up for Storage quantity
Monitor 007 Control Checker for HVAC Diagnostics

DiversiTech

SKU: TC-007
$124.29
MSRP: $142.93
You save 15%
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CH4 50% LEL Air Balance 103 Liter Calibration Gas Cylinder

Honeywell Home

SKU: 998-022-001
$603.43
MSRP: $693.94
You save 13%
Honeywell Analytics 998-022-001 CH4 50% LEL Air Balance 103L Calibration Gas quantity
Pneumatic Calibration Kit with Two 0-30 PSI Gauges

Honeywell Home

SKU: MQP800
$719.98
MSRP: $827.98
You save 15%
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DC2800-CE-2S0-200-000-00-0 Circular Chart Recorder

Honeywell Home

SKU: DC2800CE2S02000000
$1,711.00
MSRP: $1,967.65
You save 15%
Honeywell DC2800CE2S02000000 DC2800-CE-2S0-200-000-00-0 Circular Chart Recorder quantity
7800 Series Burner Control Tester with Proving System, 120 VAC

Honeywell Home

SKU: A7800A1010
$2,761.56
MSRP: $3,175.79
You save 15%
Honeywell A7800A1010 7800 Series Burner Control Tester with Proving System, 120 VAC quantity
Zero Grade Gas Cylinder, 34L

Honeywell Home

SKU: 610-0002-000
$273.91
MSRP: $315.00
You save 15%
Honeywell 610-0002-000 Zero Grade Gas Cylinder 34L quantity
True-Line Ink Pen for Chart Recorders

Honeywell Home

SKU: 30756304-502
$883.86
MSRP: $1,016.44
You save 15%
Honeywell 30756304-502 True-Line Ink Pen for Chart Recorders quantity
Motor, Pen Arm Assembly – Replacement Drive Component

Honeywell Home

SKU: 30756114-501
$547.63
MSRP: $629.77
You save 15%
Honeywell 30756114-501 Motor, Pen Arm Assembly quantity
Servo-Plate for Chart Recorder

Honeywell Home

SKU: 30754975-503
$880.40
MSRP: $1,012.46
You save 15%
Honeywell 30754975-503 Servo-Plate for Chart Recorder quantity
Purple Chart Recorder Pens, 6-Pack

Honeywell Home

SKU: 30735489-007
$206.49
MSRP: $237.46
You save 15%
Honeywell 30735489-007 Purple Chart Recorder Pens, 6-Pack quantity
Red Pen #2 for Chart Recorders, 6-Pack

Honeywell Home

SKU: 30735489-002
$206.49
MSRP: $237.46
You save 15%
Honeywell 30735489-002 Red Pen #2 for Chart Recorders, 6-Pack quantity
Receiver Gauge, 25-125°F Scale, 1-1/2″ Face, 1/8″ Center Back

Honeywell Home

SKU: 14000786-001
$182.29
MSRP: $209.63
You save 15%
Honeywell 14000786-001 Receiver Gauge, 25-125°F, 1-1/2" Face, 1/8" CB quantity
1-1/4 MPT Refrigeration Sight Glass

Henry Technologies

SKU: SG-1210
$44.75
MSRP: $51.46
You save 15%
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3/4 MPT Refrigeration Sight Glass

Henry Technologies

SKU: SG-1206
$26.93
MSRP: $30.97
You save 15%
Henry Technologies SG-1206 3/4 MPT Refrigeration Sight Glass quantity
Sight Glass for Refrigeration Systems

Henry Technologies

SKU: MI-3
$54.55
MSRP: $62.73
You save 15%
Henry Technologies MI-3 Sight Glass quantity
Sight Glass for Refrigeration Systems

Henry Technologies

SKU: LI-3
$44.99
MSRP: $51.74
You save 15%
Henry Technologies LI-3 Sight Glass quantity
1/8″ MPT Pressure Gauge for HVAC & Refrigeration Systems

Henry Technologies

SKU: G15
$21.76
MSRP: $25.02
You save 15%
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Precision Linear Strain Gauge for Refrigeration Systems

Heatcraft Refrigeration

SKU: 2292625
$241.63
MSRP: $277.87
You save 15%
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AK Service Tool for Danfoss Refrigeration Controls

Danfoss

SKU: 080Z0262
$60.30
MSRP: $69.35
You save 13%
Danfoss 080Z0262 AK Service Tool quantity
Pressure Gauge (PSI) with Mounting Clip and Gasket

Midea

SKU: 7839764
$85.66
MSRP: $98.51
You save 15%
Midea 7839764 Pressure Gauge (PSI) with Clip and Gasket quantity
Flow Meter for Hydronic Heating Systems

Utica-Dunkirk

SKU: FE3980C360
$90.04
MSRP: $103.55
You save 13%
Utica-Dunkirk FE3980C360 Flow Meter quantity
Analog Test Kit TK-99E for Backflow Preventer Testing

Watts

SKU: 0385511
$3,645.78
MSRP: $4,192.65
You save 15%
Watts 0385511 Analog Test Kit TK-99E quantity
Dual Function Level Control for Reliable Liquid Level Sensing

Warrick-Gems Sensors & Controls

SKU: DFC1B0K
$489.81
MSRP: $563.28
You save 13%
Warrick-Gems Sensors & Controls DFC1B0K Dual Function Level Control quantity
0.5 GPM FS-380 Flow Meter for HVAC & Hydronic Systems

Warrick-Gems Sensors & Controls

SKU: 179993
$788.16
MSRP: $906.38
You save 15%
Warrick-Gems Sensors & Controls 179993 0.5 GPM FS-380 Flow Meter quantity
1″ Lead Free Auto Reseating T&P Relief Valve, 125 PSI, 210°F

Watts

SKU: F556018
$2,158.42
MSRP: $2,482.18
You save 15%
Watts F556018 1" Lead Free Auto Reseating T&P Relief Valve, 125 PSI, 210°F quantity
3/4″ Lead Free Auto Reseating T&P Relief Valve, 125 psi, 210°F

Watts

SKU: F556015
$558.28
MSRP: $642.02
You save 13%
Watts F556015 3/4" LF40XL-5 Lead Free Auto Reseating T&P Relief Valve, 125 psi, 210°F quantity
3/4″ Lead Free Auto Reseating T&P Relief Valve, 125 psi, 210°F

Watts

SKU: F556013
$665.24
MSRP: $765.03
You save 15%
Watts F556013 3/4" LF40L-3 Lead Free Auto Reseating T&P Relief Valve 125 psi 210°F quantity
1″ Lead Free Auto Reseating T&P Relief Valve, 100 PSI, 210°F

Watts

SKU: F556006
$1,079.88
MSRP: $1,241.86
You save 15%
Watts F556006 1" LF40XL-4 Lead Free Auto Reseating T&P Relief Valve, 100 PSI, 210°F quantity
2″ 740 Iron Boiler Pressure Relief Valve, 50 psi, Expanded Outlets

Watts

SKU: F384292
$1,430.76
MSRP: $1,645.37
You save 13%
Watts F384292 2" 740 Iron Boiler Pressure Relief Valve, 50 psi, Expanded Outlets quantity
2″ 740 Iron Boiler Pressure Relief Valve, 45 psi, Expanded Outlets

Watts

SKU: F384242
$2,032.23
MSRP: $2,337.06
You save 15%
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1-1/4″ 740 Iron Boiler Pressure Relief Valve, 45 PSI, Expanded Outlets

Watts

SKU: F383308
$1,010.59
MSRP: $1,162.18
You save 15%
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1″ 740 Iron Boiler Pressure Relief Valve, 60 psi, Expanded Outlets

Watts

SKU: F382870
$653.34
MSRP: $751.34
You save 15%
Watts F382870 1" 740 Iron Boiler Pressure Relief Valve, 60 psi, Expanded Outlets quantity
1-1/2″ Bronze Auto-Reseating T&P Relief Valve, 150 PSI, 210°F

Watts

SKU: F344276
$1,656.33
MSRP: $1,904.78
You save 13%
Read more
3/4″ LLL40XL-5 Bronze Auto Reseating T&P Relief Valve, 150 PSI, 210°F

Watts

SKU: F163803
$528.80
MSRP: $608.12
You save 13%
Watts F163803 3/4" LLL40XL-5 Bronze Auto Reseating T&P Relief Valve, 150 PSI, 210°F quantity
1″ 40XL-7 Bronze Auto Reseating T&P Relief Valve, 150 psi, 210°F

Watts

SKU: F163765
$260.55
MSRP: $299.63
You save 15%
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1-1/2″ LF340 Lead Free T&P Relief Valve, 125 PSI, 210°F, Flood Sensor

Watts

SKU: F121601
$4,589.99
MSRP: $5,278.49
You save 15%
Watts F121601 1-1/2" LF340 Lead Free T&P Relief Valve 125 PSI 210°F w/ Flood Sensor quantity
3/4″ Lead Free Auto Reseating T&P Relief Valve, 150 psi, 210°F

Watts

SKU: F121459
$761.00
MSRP: $875.15
You save 15%
Watts F121459 3/4" LF140X-8 Lead Free Auto Reseating T&P Relief Valve quantity

Test Instruments

Brand

Category

Voltage

Temperature

Brand

Category

Voltage

Temperature