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 145–192 of 450 resultsSorted by popularity

Rope Water Sensor for Leak Detection

Rheem

SKU: AP18944D
$27.30
MSRP: $31.40
You save 15%
Rheem-Ruud AP18944D Rope Water Sensor quantity
Rope Water Sensor for Leak Detection

Rheem

SKU: AP16678
$26.56
MSRP: $30.54
You save 15%
Rheem-Ruud AP16678 Rope Water Sensor quantity
Pilot Ignitor Assembly with Sight Glass

Rheem

SKU: AP15960
$303.78
MSRP: $349.35
You save 15%
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AC/DC Non-Reset Hour Meter with 1/4″ Speed Drive

Redington

SKU: 3410-1000
$83.61
MSRP: $96.15
You save 15%
Redington 3410-1000 AC/DC Non-Reset Hour Meter with 1/4" Speed Drive quantity
Thermometer Kit, 45–85°F Temperature Range, 5-Pack

Siemens

SKU: 192-786
$116.19
MSRP: $133.62
You save 15%
Siemens Building Technology 192-786 Thermometer Kit 45-85°F, 5-Pack quantity
Test Probe with Gauge and Wrench, SKU 192-633

Siemens

SKU: 192-633
$58.56
MSRP: $67.34
You save 15%
Siemens Building Technology 192-633 Test Probe with Gauge and Wrench quantity
2.5″ Pressure Gauge, 0–30 PSI Range, 1/4″ Barb Connection

Siemens

SKU: 142-0311
$65.56
MSRP: $75.39
You save 15%
Siemens Building Technology 142-0311 2.5" Gauge 0/30 PSI 1/4" Barb quantity
PSG-7S 7/8″ ODF Refrigeration Sight Glass

Parker-Sporlan

SKU: 700509-002
$70.31
MSRP: $80.86
You save 15%
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PSG-5S 5/8″ ODF Refrigeration Sight Glass

Parker-Sporlan

SKU: 700418-002
$45.34
MSRP: $52.14
You save 15%
Parker-Sporlan 700418-002 PSG-5S 5/8" ODF Refrigeration Sight Glass quantity
PSG-3S 3/8″ ODF Refrigeration Sight Glass

Parker-Sporlan

SKU: 700132-002
$34.86
MSRP: $40.09
You save 15%
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PSG-3MF 3/8″ Flare Refrigerant Sight Glass

Parker-Sporlan

SKU: 700093-001
$36.85
MSRP: $42.38
You save 15%
Parker-Sporlan 700093-001 PSG-3MF 3/8" Flare Refrigerant Sight Glass quantity
Glycol Refractometer for HVAC Hydronic Systems

Nu-Calgon

SKU: 61301
$163.38
MSRP: $187.89
You save 15%
Nu-Calgon 61301 Glycol Refractometer quantity
Refrigeration Oil Analysis Kit for System Diagnostics

Nu-Calgon

SKU: 4996-0
$164.63
MSRP: $189.32
You save 15%
Nu-Calgon 4996-0 Refrigeration Oil Analysis Kit quantity
C-1520 Oil Refractometer for HVAC Refrigeration Systems

Nu-Calgon

SKU: 4815-0
$370.61
MSRP: $426.20
You save 15%
Nu-Calgon 4815-0 C-1520 Oil Refractometer for HVAC Refrigeration Systems quantity
Phase III Refrigerant Oil Test Kit for HVAC Systems

Nu-Calgon

SKU: 4320-W8
$21.36
MSRP: $24.56
You save 15%
Nu-Calgon 4320-W8 Phase III Refrigerant Oil Test Kit quantity
Motor Testing Tool for Nordyne HVAC Systems

Nordyne

SKU: 921767
$70.79
MSRP: $81.41
You save 15%
Nordyne 921767 Motor Testing Tool quantity
Flow Meter for NTI Boiler Systems

NTI Boiler

SKU: 64980195
$55.78
MSRP: $64.15
You save 15%
NTI Boiler 64980195 Flow Meter quantity
Sight Glass Assembly for NTI Boilers

NTI Boiler

SKU: 6000085641
$153.36
MSRP: $176.36
You save 15%
NTI Boiler 6000085641 Sight Glass Assembly quantity
Mini-Split Service Tool for Mitsubishi Systems

Mitsubishi

SKU: PAC-SK52ST
$159.48
MSRP: $183.40
You save 15%
Mitsubishi PAC-SK52ST Service Tool quantity
Power Monitor Receiver for Mitsubishi HVAC Systems

Mitsubishi

SKU: E22F28468
$18.50
MSRP: $21.28
You save 15%
Mitsubishi E22F28468 Power Monitor Receiver quantity
3/4″ EPDM Gasket Sight Glass for Hydronic & Steam Systems

Mars

SKU: 43305
$3.69
MSRP: $4.24
You save 15%
Mars 43305 3/4" EPDM Gasket Sight Glass quantity
Low Range Differential Pressure Transmitter, 0 to ±2.0″ w.c.

Maxon

SKU: 57339
$1,280.73
MSRP: $1,472.84
You save 15%
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1/2″ NPT Rough Bronze Water Gauge, 5/8″ OD x 12″ Glass, 125 PSI

Maxon

SKU: 42148
$144.74
MSRP: $166.45
You save 15%
Maxon 42148 1/2" NPT Rough Bronze Water Gauge, 5/8" OD x 12" Glass, 125 PSI @ 350°F quantity
Digital Thermometer for Precise Temperature Measurement

Miscellaneous Product

SKU: TNC-TM165-010
$538.65
MSRP: $619.45
You save 15%
AMETEK NCC TNC-TM165-010 Digital Thermometer quantity
6 ft Temperature Probe for HVAC Sensing Applications

Miscellaneous Product

SKU: ASP-TM165-011
$131.29
MSRP: $150.98
You save 15%
Ametek NCC ASP-TM165-011 6 ft Temperature Probe quantity
Flood Sensor Replacement Part for Modine Equipment

Modine

SKU: 5H1026650001
$118.58
MSRP: $136.37
You save 15%
Modine 5H1026650001 Flood Sensor Replacement Part quantity
Flood Sensor for Modine HVAC Equipment

Modine

SKU: 3H1009790003
$102.90
MSRP: $118.34
You save 15%
Modine 3H1009790003 Flood Sensor quantity
Pressure Gauge for HVAC & Refrigeration Systems

Mueller Industries

SKU: P36214
$80.36
MSRP: $92.41
You save 15%
Mueller Industries P36214 Pressure Gauge quantity
Sight Glass Kit for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100311165
$147.11
MSRP: $169.18
You save 15%
Lochinvar & A.O. Smith 100311165 Sight Glass Kit quantity
3″ PVC Flue Adapter with Combustion Analyzer Port

Lochinvar & A.O. Smith

SKU: 100275600
$147.01
MSRP: $169.06
You save 15%
Lochinvar & A.O. Smith 100275600 3" PVC Flue Adapter with Analyzer Port quantity
Fan Tester Assembly – OEM Replacement Part

Lochinvar & A.O. Smith

SKU: 100208463
$372.54
MSRP: $428.42
You save 15%
Lochinvar & A.O. Smith 100208463 Fan Tester Assembly quantity
Sight Glass Replacement Part, SKU 100208332

Lochinvar & A.O. Smith

SKU: 100208332
$40.20
MSRP: $46.23
You save 15%
Lochinvar & A.O. Smith 100208332 Sight Glass quantity
Temperature & Pressure Gauge Kit, 0-200 PSI, 50-320°F

Lochinvar & A.O. Smith

SKU: 100208154
$93.03
MSRP: $106.98
You save 15%
Lochinvar & A.O. Smith 100208154 Temperature & Pressure Gauge Kit 0-200 PSI 50-320°F quantity
Sight Glass Kit for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100163259
$72.36
MSRP: $83.21
You save 15%
Lochinvar & A.O. Smith 100163259 Sight Glass Kit quantity
Sight Glass Kit for Lochinvar & A.O. Smith Equipment

Lochinvar & A.O. Smith

SKU: 100163249
$148.18
MSRP: $170.41
You save 15%
Lochinvar & A.O. Smith 100163249 Sight Glass Kit quantity
0-250°F Temperature Gauge for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100147003
$58.58
MSRP: $67.37
You save 15%
Lochinvar & A.O. Smith 100147003 0-250F Temperature Gauge quantity
Heat Exchanger Pressure Test Kit

Lennox

SKU: 74K96
$1,371.84
MSRP: $1,577.62
You save 15%
Lennox 74K96 Heat Exchanger Pressure Test Kit quantity
Refrigeration Sight Glass, OEM Lennox Replacement Part

Lennox

SKU: 49L04
$26.09
MSRP: $30.00
You save 15%
Lennox 49L04 Refrigeration Sight Glass quantity
1/2″ Pete’s Plug Test Plug for Hydronic Systems

Kodiak Controls

SKU: PT50NOR
$10.24
MSRP: $11.78
You save 15%
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1/4″ Pete’s Plug Test Plug for Pipe & Hydronic Systems

Kodiak Controls

SKU: PT25NOR
$9.35
MSRP: $10.75
You save 15%
Read more
4″ Dial 0-300 PSI 1/4″ NPT Lower Mount Liquid-Filled Industrial Gauge

Kodiak Controls

SKU: KC201L40300
$48.59
MSRP: $55.88
You save 15%
Kodiak Controls KC201L40300 4" Dial 0-300 PSI 1/4" NPT Lower Mount Liquid-Filled Industrial Gauge quantity
4″ Dial 0-100 PSI 1/4″ NPT Lower Mount Liquid Filled Industrial Gauge

Kodiak Controls

SKU: KC201L40100
$48.59
MSRP: $55.88
You save 15%
Kodiak Controls KC201L40100 4" Dial 0-100 PSI 1/4" NPT Lower Mount Liquid Filled Industrial Gauge quantity
1-1/2″ Dial 0-30 PSI 1/8″ NPT Back Mount Dry Case Utility Gauge

Kodiak Controls

SKU: KC10215830
$7.56
MSRP: $8.69
You save 15%
Kodiak Controls KC10215830 1-1/2" Dial 0-30 PSI 1/8" NPT Back Mount Dry Case Utility Gauge quantity
3-1/2″ Dial 0-100 PSI 1/4″ NPT Lower Mount Dry Utility Gauge

Kodiak Controls

SKU: KC10135100
$15.04
MSRP: $17.30
You save 15%
Kodiak Controls KC10135100 3-1/2" Dial 0-100 PSI 1/4" NPT Lower Mount Dry Utility Gauge quantity
2-1/2″ Dial 0-100 PSI 1/4″ NPT Lower Mount Dry Case Utility Gauge

Kodiak Controls

SKU: KC10125100
$7.56
MSRP: $8.69
You save 15%
Kodiak Controls KC10125100 2-1/2" Dial 0-100 PSI 1/4" NPT Lower Mount Dry Case Utility Gauge quantity
2″ Dial 0-60 PSI 1/4″ NPT Lower Mount Dry Case Utility Gauge

Kodiak Controls

SKU: KC1012060
$8.78
MSRP: $10.10
You save 15%
Kodiak Controls KC1012060 2" Dial 0-60 PSI 1/4" NPT Lower Mount Dry Utility Gauge quantity
2-1/2″ Dial 0-15″WC 1/4″ NPT Lower Mount Dry Low Pressure Gauge

Kodiak Controls

SKU: 25-15WC
$52.58
MSRP: $60.47
You save 15%
Kodiak Controls 25-15WC 2-1/2" Dial 0-15"WC 1/4" NPT Lower Mount Dry Gauge quantity
Water Detector with 10 ft. Sensing Tape

Johnson Controls

SKU: WD-2-T-10
$299.79
MSRP: $344.76
You save 15%
Johnson Controls WD-2-T-10 Water Detector with 10 ft. Sensing Tape quantity