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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Temperature

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Voltage

Temperature

Showing 193–240 of 497 resultsSorted by popularity

3″ PVC Flue Adapter with Combustion Analyzer Port

Lochinvar & A.O. Smith

SKU: 100275600
$143.75
MSRP: $165.31
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
$363.26
MSRP: $417.75
You save 15%
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Sight Glass Replacement Part, SKU 100208332

Lochinvar & A.O. Smith

SKU: 100208332
$39.30
MSRP: $45.20
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
$90.96
MSRP: $104.60
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
$70.56
MSRP: $81.14
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
$144.89
MSRP: $166.62
You save 15%
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0-250°F Temperature Gauge for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100147003
$57.28
MSRP: $65.87
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 System Testing

Kodiak Controls

SKU: PT50NOR-KC
$10.24
MSRP: $11.78
You save 15%
Kodiak Controls PT50NOR 1/2" Pete's Plug Test Plug quantity
1/2″ Pete’s Plug Test Plug for Hydronic Systems

Kodiak Controls

SKU: PT50NOR
$10.24
MSRP: $11.78
You save 15%
Kodiak Controls PT50NOR 1/2" Pete's Plug Test Plug | PT50NOR quantity
1/4″ Pete’s Plug Self-Sealing Hydronic Test Plug

Kodiak Controls

SKU: PT25NOR-KC
$9.35
MSRP: $10.75
You save 15%
Kodiak Controls PT25NOR 1/4" Pete's Plug Test Plug - PT25NOR-KC quantity
1/4″ Pete’s Plug Test Plug for Pipe & Hydronic Systems

Kodiak Controls

SKU: PT25NOR
$9.35
MSRP: $10.75
You save 15%
Kodiak Controls PT25NOR 1/4" Pete's Plug Test Plug quantity
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 0-200 PSI 1/4″ NPT Lower Mount Liquid Filled Industrial Gauge

Kodiak Controls

SKU: KC201L40200-KC
$48.59
MSRP: $55.88
You save 15%
Kodiak Controls KC201L40200 4" Dial 0-200 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-KC
$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
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-KC
$7.56
MSRP: $8.69
You save 13%
Kodiak Controls KC10215830 1-1/2" Dial 0-30 PSI 1/8" NPT Back Mount Dry Case Utility 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
9″ Dial Thermometer, 3.5″ Stem, 30–300°F Range

Kodiak Controls

SKU: AS5H-9-30/300-KC
$50.70
MSRP: $58.31
You save 15%
Kodiak Controls AS5H-9-30/300-KC 9" Dial Thermometer, 3.5" Stem, 30-300°F quantity
9″ Dial Thermometer, 3.5″ Stem, 30–300°F Range

Kodiak Controls

SKU: AS5H-9-30/300
$50.70
MSRP: $58.31
You save 15%
Kodiak Controls AS5H-9-30/300 9" Dial Thermometer, 3.5" Stem, 30–300°F quantity
9″ Dial Thermometer, 3.5″ Stem, 30–240°F Range

Kodiak Controls

SKU: AS5H-9-30/240
$50.70
MSRP: $58.31
You save 15%
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9″ Dial Thermometer, 3.5″ Stem, 20–180°F Temperature Range

Kodiak Controls

SKU: AS5H-9-20/180-KC
$50.70
MSRP: $58.31
You save 15%
Kodiak Controls AS5H-9-20/180-KC 9" Thermometer, 3.5" Stem, 20-180°F quantity
9″ Dial Thermometer, 3.5″ Stem, 20–180°F Range

Kodiak Controls

SKU: AS5H-9-20/180
$50.70
MSRP: $58.31
You save 15%
Kodiak Controls AS5H-9-20/180 9" Dial Thermometer, 3.5" Stem, 20–180°F quantity
0/100 PSI 70/320°F Combination Gauge, 1/2″ Back, 2″ Stem

Kodiak Controls

SKU: 4104-3.25-2-70-KC
$40.46
MSRP: $46.53
You save 13%
Kodiak Controls 4104-3.25-2-70 0/100 PSI 70/320°F 1/2" Back 2" Stem Gauge quantity
Dual-Scale Gauge 0/100 PSI, 70/320°F, 1/2″ Back, 2″ Stem

Kodiak Controls

SKU: 4104-3.25-2-70
$40.46
MSRP: $46.53
You save 13%
Kodiak Controls 4104-3.25-2-70 Dual-Scale Gauge 0/100 PSI 70/320°F 1/2" Back 2" Stem quantity
Pressure & Temp Gauge 0-75 PSI, 70-320°F, 1/4″ Back, 0.95″ Stem

Kodiak Controls

SKU: 4104-2.5-4-10
$21.54
MSRP: $24.77
You save 13%
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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
Pneumatic Temperature Indicator, 3-1/2″ Dial, 40–240°F Range

Johnson Controls

SKU: T-5500-1055
$394.11
MSRP: $453.23
You save 15%
Johnson Controls T-5500-1055 Pneumatic Temperature Indicator, 3-1/2" Dial quantity
Pneumatic Temperature Indicator, 3-1/2″ Dial, 0–100°F Range

Johnson Controls

SKU: T-5500-1052
$394.11
MSRP: $453.23
You save 15%
Johnson Controls T-5500-1052 Pneumatic Temperature Indicator, 3-1/2" Dial quantity
Beige Plastic Cover & Faceplate, Vertical Mount, 2 Setpoint Windows

Johnson Controls

SKU: T-4756-1739
$56.66
MSRP: $65.16
You save 15%
Johnson Controls T-4756-1739 Beige Plastic Thermostat Cover with Thermometer quantity
Air Pressure Gage, 0-30 PSIG / 0-200 kPa, 2″ Face, Stem Mount

Johnson Controls

SKU: G-2010-11
$62.19
MSRP: $71.52
You save 15%
Johnson Controls G-2010-11 Air Pressure Gage, 0-30 PSIG / 0-200 kPa, 2" Face quantity
Liquid Level Switch, Sump Operation, DPST, Fixed Mounting, NEMA 1

Johnson Controls

SKU: F59H-1
$194.53
MSRP: $223.71
You save 15%
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Liquid Level Switch, Sump Operation, DPST, NEMA 1, 120/240 VAC

Johnson Controls

SKU: F59A-1
$223.11
MSRP: $256.58
You save 15%
Johnson Controls F59A-1 Liquid Level Switch, Sump, DPST, NEMA 1, 120/240 VAC quantity
Oil Indicator with Valve for Reliable System Monitoring

Johnson Controls

SKU: A-4000-120
$175.91
MSRP: $202.30
You save 15%
Johnson Controls A-4000-120 Oil Indicator with Valve quantity
N5B Gas Pressure Regulator 3/4″ NPT 7–11″ WC 2 lb Inlet w/Vent

Norgas Controls and Metering

SKU: N5B-0750-S-VL0375
$49.26
MSRP: $56.65
You save 15%
Norgas Controls and Metering N5B-0750-S-VL0375 N5B Gas Regulator 3/4" NPT 7-11" WC 2 lb w/Vent quantity
1″ Internal Relief Valve, 1/2×9/16″ Orifice, 6–16″ W.C. Dark Green

Norgas Controls and Metering

SKU: B42R-1
$150.15
MSRP: $172.67
You save 15%
Norgas Controls and Metering B42R-1 1" IRV, 1/2x9/16" Orifice, 6-16" W.C. Dark Green quantity
3/8″ Diameter Aluminum Orifice for Gas Metering Applications

Norgas Controls and Metering

SKU: 757631
$27.91
MSRP: $32.10
You save 15%
Norgas Controls and Metering 757631 3/8" Dia Aluminum Orifice quantity
L5 Actuator with 3/4″ Ball Valve and Leak Sensor

Honeywell Home

SKU: VWS01Y-3/4
$322.31
MSRP: $376.73
You save 14%
Honeywell VWS01Y-3/4 L5 Actuator with 3/4" Ball Valve and Leak Sensor quantity
L5 Actuated 1-1/4″ Ball Valve with Integrated Leak Sensor

Honeywell Home

SKU: VWS01Y-11/4
$443.36
MSRP: $509.86
You save 15%
Honeywell VWS01Y-11/4 L5 Actuated 1-1/4" Ball Valve with Leak Sensor quantity
2.5″ Dial Thermometer with 1/2″ Thermowell Connection

Honeywell Home

SKU: TG250-UT
$19.83
MSRP: $22.80
You save 15%
Honeywell TG250-UT 2.5" Dial Thermometer with 1/2" Thermowell quantity
1″ NPT Magnetic Water Meter for Hydronic Systems

Honeywell Home

SKU: HCW-MMAG1NL
$757.41
MSRP: $871.02
You save 15%
Honeywell HCW-MMAG1NL 1" NPT Magnetic Water Meter quantity
Class 2000 KWH Meter, 480V, 100 Amp, Steel Enclosure

Honeywell Home

SKU: E20-480100-JKIT
$1,255.43
MSRP: $1,443.74
You save 15%
Honeywell E20-480100-JKIT Class 2000 KWH Meter, 480V, 100A, Steel Enclosure quantity
Class 2000 KWH Meter, 208V, 200 Amp, Steel Enclosure

Honeywell Home

SKU: E20-208200-JKIT
$1,130.23
MSRP: $1,299.76
You save 15%
Honeywell E20-208200-JKIT Class 2000 KWH Meter, 208V, 200A, Steel Enclosure quantity

Test Instruments

Brand

Category

Voltage

Temperature

Brand

Category

Voltage

Temperature