Diagnostic & Testing Tools
- Code Readers & Scanners
- Anti-Freeze & Coolant Testers
- Electrical Testers
- Timing Lights
- Fuel System Testers
- Ignition Testers
- Brake Testers & Measuring Tools
- Coating Thickness Gauges
- Oil Pressure Test Tools
- Engine Compression Testers
- Diagnostic Leak Detection
- Headlight Alignment Systems
- Suspension Testers
- Vehicle Scales
- Refrigerant Identifiers
- Window Tint Meters
- Exhaust System Testers
- Auto Inspection Cameras & Scopes
Featured Brands
- CTA®12 V/24 V/48 V Audible Circuit Tester (2830)Universal 12 V/24 V/48 V Audible Circuit Tester by CTA®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and...Digital display reads the accurate voltage valueAUDIBLE Tone is heard when current is detected$46.93
- CTA®6 V/12 V/24 V Computer-Safe Logic Tester (3031)Universal 6 V/12 V/24 V Computer-Safe Logic Tester by CTA®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your electrical system maintenance needs,...High impedance tester protects computer circuitry, drawing less than 7 milliampsDual color LED indicates red for power and green for ground$21.10
- CTA®6 V/12 V/48 V Digital Circuit Tester Kit (5059)Universal 6 V/12 V/48 V Digital Circuit Tester Kit by CTA®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs...Used to check voltage value on systemsSmall testing current$57.16
- CTA®92-piece Master Line Kit (7662)Universal 92-piece Master Line Kit by CTA®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your electrical system maintenance needs, delivering features...Comprehensive electrical testing kit for cars, trucks, tractors, ATVs, Motorcycles, boats & moreEffortlessly analyze voltage, continuity, impedance and current$270.99
- CTEK®Comfort Indicator Pigtail (56-564)Universal Comfort Indicator Pigtail by CTEK®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver...An INDICATOR is the easiest way to monitor the charge in your batteryAn accurate voltage reading for your battery is displayed two hours after you’ve used your vehicle$11.51
- CTEK®Comfort Indicator with Cig Plug Connection (56-870)Universal Comfort Indicator with Cig Plug Connection by CTEK®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs...Charge your battery through your vehicles 12v socketLights give you status of battery - green, yellow, red$17.28
- Cal-Van Tools®12 V Quick Ripple Tester (73)Universal 12 V Quick Ripple Tester by Cal-Van Tools®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your electrical system maintenance needs, delivering...The Quick Ripple Tester is designed to easily and efficiently test alternators for a variety of issues including ripple through the DC outlet cigarette lighterAllows the user to test an alternator for bad diodes bad stators and intermittent diodes or stators without ever lifting the hood$58.00
- Cal-Van Tools®12 V/24 V Pro Relay Circuit Tester (76)Universal 12 V/24 V Pro Relay Circuit Tester by Cal-Van Tools®. The 76 Relay Circuit Pro is a tool that can test an entire circuit from the battery to the component in question as well as determining if the relay itself is functioning...Designed for your maintenance needsMade from high-grade material for a long lifespan$180.48
- Dorman®1" Insulated Alligator Clips (85650)Universal 1" Insulated Alligator Clips by Dorman®. Dorman offers a comprehensive line of Alligator Clips for almost any automotive electrical repair. All Alligator Clips are constructed of high-quality materials for long-lasting...Conveniently packaged in a variety of piece counts to assist with both small and large projectsAlso suitable for a broad range of household, industrial and commercial uses$1.73
- Dorman®1-1/2" Alligator Clip with Screw (85652)Universal 1-1/2" Alligator Clip with Screw by Dorman®. Dorman offers a comprehensive line of Alligator Clips for almost any automotive electrical repair. All Alligator Clips are constructed of high-quality materials for long-lasting...Conveniently packaged in a variety of piece counts to assist with both small and large projectsAlso suitable for a broad range of household, industrial and commercial uses$1.91
- Dorman®10' Test Leads (84610)Universal 10' Test Leads by Dorman®. Dorman's retractable test leads are indispensable for having on hand in the shop or the garage. Save time by keeping them visible and available: the magnetic backing on the case firmly affixes to...Essential for reliable testing of electrical circuitsEasy to use$9.51
- Dorman®12 V Alternator and Battery Tester (84502)Universal 12 V Alternator and Battery Tester by Dorman®. Dorman offers a comprehensive line of Electrical Multi-Testers for almost any automotive repair. All Electrical Multi-Testers are constructed of high-quality materials for...Testers light up and/or buzz to indicate testing resultDurably designed for a long service life$9.45
- Dorman®12 V Circuit Tester with LCD Display (88058)Universal 12 V Circuit Tester with LCD Display by Dorman®. Dorman offers a comprehensive line of Electrical Multi-Testers for almost any automotive repair. All Electrical Multi-Testers are constructed of high-quality materials for...Testers light up and/or buzz to indicate testing resultDurably designed for a long service life$13.69
- Dorman®15" Multi Purpose Ground Strap (60213)Universal 15" Multi Purpose Ground Strap by Dorman®. Dorman offers a line of Body Electrical Ground Straps for a wide range of applications. All Body Electrical Ground Straps are constructed of high-quality materials for long-lasting...Strap measures 15" in length to cover most usesMade of copper for high conductivity$4.24
- Dorman®3/8" Copper Ring Lugs with Insulation (86184)Universal 3/8" Copper Ring Lugs with Insulation by Dorman®. Dorman offers a comprehensive line of Copper Lugs for almost any automotive repair. All Copper Lugs are constructed of high-quality materials for long-lasting durability.Conveniently packaged in a variety of piece counts to assist with both small and large projectsAlso suitable for a broad range of industrial and commercial uses$2.82
- Dorman®399-piece Automotive Electrical Repair Kit with Case (86689C)Universal 399-piece Automotive Electrical Repair Kit with Case by Dorman®. Electrical Diagnostic and Repair Kit contains an assortment of the most popular items needed to complete electrical repairs. Conveniently packaged in a reusable...A cost-efficient and time-saving alternative to purchasing each component separatelyConveniently packaged in a durable plastic tray for protected storage$43.31
- Dorman®9" Computer Safe Test Probe (86602)Universal 9" Computer Safe Test Probe by Dorman®. For accurate testing of voltage and amperage sensitive circuits, use Diagnostic Test Probes. Replacement is constructed of high-quality materials for durability and a longer service life.Quality plastic, copper, and aluminum constructionSafe to use on computer controlled circuits$23.05
- Dorman®Un-insulated Alligator Clip Leads (85654)Universal Un-insulated Alligator Clip Leads by Dorman®. Dorman offers a comprehensive line of Alligator Clips for almost any automotive electrical repair. All Alligator Clips are constructed of high-quality materials for long-lasting...Many different lengths availableConveniently packaged in a variety of piece counts to assist with both small and large projects$2.70
- FJC®12 V 500 A Carbon Pile Battery Load Tester (45115)Universal 12 V 500 A Carbon Pile Battery Load Tester (45115) by FJC®. The Power Division of FJC is an industry-leading manufacturer and distributor of power electronic products and systems for mobile markets including battery testers,...Test alternators, regulators & startersSeparate Volt and A meters$142.24
- FJC®6 V/12 V 100 A Battery Tester (45110)Universal 6 V/12 V 100 A Battery Tester (45110) by FJC®. The Power Division of FJC is an industry-leading manufacturer and distributor of power electronic products and systems for mobile markets including battery testers, chargers,...Test car / truck batteries of current draw, voltage, and alternator performanceQuick 10 second load test$45.10
- FJC®6 V/12 V 125 A Battery Tester (45107)Universal 6 V/12 V 125 A Battery Tester (45107) by FJC®. The Power Division of FJC is an industry-leading manufacturer and distributor of power electronic products and systems for mobile markets including battery testers, chargers,...Test car / truck batteries of current draw, voltage, and alternator performanceQuick 10 second load test$46.01
- FJC®6 V/12 V/24 V 1000 A Carbon Pile Battery Load Tester (45118)Universal 6 V/12 V/24 V 1000 A Carbon Pile Battery Load Tester (45118) by FJC®. The Power Division of FJC is an industry-leading manufacturer and distributor of power electronic products and systems for mobile markets including battery...Tests alternators, regulators & startersLarge, easy-to-read gauges$446.27
- GearWrench®6 V/12 V High-Low Circuit Tester (129D)Universal 6 V/12 V High-Low Circuit Tester by GearWrench®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your electrical system maintenance needs,...Tests voltage in 6 and 12V systems by grounding the clip and touching the probe to the point being testedTester bulb will light if power is present$12.29
- GearWrench®Remote Control Starter Switch (124DD)Universal Remote Control Starter Switch by GearWrench®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your electrical system maintenance needs,...Made of heavy-duty construction and has long leadUse for GE generator, starter, electrical, fuel pump and compression tests and for setting ignition points and adjusting tappets$18.84
- Lang Tools®10' 3 Leads Magnetic Retractable Test Leads with Insulated Alligator Clip (1135)Universal 10' 3 Leads Magnetic Retractable Test Leads with Insulated Alligator Clip (1135) by Lang Tools®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for...Retractable test leads pull out and stay at desired length and rewind into its own protective case when not in useDesigned for your maintenance needs$26.51
- Lang Tools®10' 3 Leads Retractable Test Leads with Insulated Alligator Clip (1129)Universal 10' 3 Leads Retractable Test Leads with Insulated Alligator Clip (1129) by Lang Tools®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your...Retractable test leads pull out and stay at desired length and rewind into its own protective case when not in useDesigned for your maintenance needs$17.21
- Lang Tools®30' 2 Leads Magnetic Retractable Test Leads with Insulated Alligator Clip (1138)Universal 30' 2 Leads Magnetic Retractable Test Leads with Insulated Alligator Clip (1138) by Lang Tools®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for...Retractable test leads pull out and stay at desired length and rewind into its own protective case when not in useDesigned for your maintenance needs$37.80
- Lang Tools®30' 2 Leads Retractable Test Leads with Insulated Alligator Clip (1137)Universal 30' 2 Leads Retractable Test Leads with Insulated Alligator Clip (1137) by Lang Tools®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your...Retractable test leads pull out and stay at desired length and rewind into its own protective case when not in useDesigned for your maintenance needs$30.88
- Lang Tools®30' Retractable Test Leads with Insulated Alligator Clip (1130)Universal 30' Retractable Test Leads with Insulated Alligator Clip (1130) by Lang Tools®. Your electrical system maintenance will be easier with this high-quality product. It is specially developed and manufactured for your electrical...Retractable test leads pull out and stay at desired length and rewind into its own protective case when not in useDesigned for your maintenance needs$14.56
- Launch Tech®12 V Battery Tester (307050055)Universal 12 V Battery Tester (307050055) by Launch Tech®. BST-560 Battery Tester adopts currently the world's most advanced conductance testing technology to easily, quickly and accurately measure the actual cold cranking amps...Battery Health with available CCAVehicle starting Voltage detection$99.67
With today’s high-tech computer and electronics packed vehicles, electronic testers and diagnostic equipment have become the main weapons in the vehicle service arsenal, so we’ve stocked our digital shelves with scan tools, multimeters, analyzers and much more. When you’re armed with these electronic tools, you’ll be able to defeat any CHECK ENGINE light, blown fuse, balky window, recalcitrant alternator, or any other electrical malfunction with ease.
Electronic testers range from simple jumper wires, also called test leads, to sophisticated engine scan tools. Test leads allow you to bypass a circuit and directly test a component by applying 12 volts from the battery. Test lights, also called circuit testers, are essential tools for determining whether voltage is present at particular points in circuits. There are circuit powered and self-powered test lights, also known as continuity testers.
Test lights can tell you whether voltage is present, but they can’t tell you how much. For specific values you need a voltmeter, which is routinely packaged with an ohmmeter and ammeter in an electronic tester called a multimeter. There are analog meters that have a needle and a scale, but Digital Multi-Meters (DMM), also known as Digital Volt Ohm Meters (DVOM) are necessary for computer controlled circuits. Voltmeters can display the amount of voltage, such as when testing a battery or charging system, and test voltage drop. Ohmmeters measure resistance in a circuit and ammeters measure current flow.
A scan tool provides access to your vehicle’s computer control system via a cable connected to the Data Link Connector (DLC). With a scan tool you can read the Diagnostic Trouble Codes (DTCs) that cause CHECK ENGINE, Air Bag, and ABS dash lights to illuminate. Tool capability varies, and some can also read, record, and playback sensor data, display I/M monitor status, read and display freeze frame data, download to a PC, and be updated via USB port. In addition to erasing DTCs, some scan tools can also be used to reset oil lights and other warning lights.
Along with the above mentioned essentials, we also have many more diagnostic time savers including noid lights to check fuel injectors, current probes to measure current without disturbing the circuit, battery testers, infrared thermometers for instantaneous temperature indication, inspection cameras for peaks into the smallest places, and much more. And if you have an older, pre-computer controlled vehicle we have the tools you need to make adjustments and keep your vehicle running right, like timing lights to check initial timing and timing advance, and dwell/tachs to set breaker points and idle speed.