Circuit Testers
DIAGNOSE WITH CONFIDENCE
Professional automotive testing tools engineered for technicians and serious DIYers.
U.S. Warehouse ShippingFast domestic fulfillment
Local U.S. SupportHelp when you need it
3-Year WarrantyCoverage on eligible products
Founded in 2008Automotive tool specialists
SHOP BY CATEGORY
Purpose-built tools for faster, more confident diagnosis.
BEST SELLERS
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PS100 Pro Automotive Electrical Circuit Tester | Power Circuit Probe, Component Activation & Short Circuit Location Tool
Regular price $75.00 USDRegular price$89.00 USDSale price $75.00 USD -
OBDResource TPS30 TPMS Relearn & Programming Tool Kit with 4 Programmable Sensors – Universal TPMS Reset, Sensor Activation & ID Write (315/433 MHz)
Regular price $199.00 USDRegular price$249.00 USDSale price $199.00 USD -
OBDResource TPS10 Universal TPMS Relearn Tool – Tire Pressure Sensor Activation, Reset & Scan Tool for 315 MHz / 433 MHz Vehicles
Regular price $69.99 USDRegular price$99.99 USDSale price $69.99 USD -
OBDResource TL123 Automotive Timing Light – 12V/24V Ignition Timing Gun with Adjustable Advance, LED Display & High-Visibility Strobe Diagnostic Tool
Regular price $99.00 USDRegular price$149.99 USDSale price $99.00 USD -
OBDResource Super EL50448 Ultra TPMS Relearn Tool Universal Frequency Detector 4-in-1
Regular price $59.99 USDRegular price$89.99 USDSale price $59.99 USD -
OBDResource Super EL50448 2-in-1 TPMS Relearn Tool for GM & Ford – Tire Pressure Sensor Reset & Activation Tool (315/433 MHz)
Regular price $17.99 USDRegular price$19.99 USDSale price $17.99 USD -
OBDResource ST100 Automotive Spark Plug Tester – Professional Spark Plug Diagnostic Tool with Indicator Lights & Wide Voltage Input
Regular price $24.99 USDRegular price$29.99 USDSale price $24.99 USD -
OBDResource RT911 Professional 12V/24V Automotive Relay Tester – Fast Relay Function Check & LED Indicator Diagnostic Tool
Regular price $24.99 USDRegular price$29.99 USDSale price $24.99 USD
BUILT FOR THE PEOPLE WHO KEEP CARS MOVING
PROFESSIONAL TOOLS. LOCAL SUPPORT.
Since 2008, OBDResource has developed reliable automotive diagnostic and testing tools for technicians, repair shops, and serious DIYers. Our U.S. team provides local inventory, responsive support, and dependable warranty service.
Founded in 2008U.S. inventory & support
LEARN ABOUT OBDRESOURCEFROM THE GARAGE
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How to Adjust Ignition Timing with a Timing Lig...
For DIY car enthusiasts, auto repair technicians, and classic car owners, learning how to adjust ignition timing with a timing light is a valuable skill. In this guide, we will...
How to Adjust Ignition Timing with a Timing Lig...
For DIY car enthusiasts, auto repair technicians, and classic car owners, learning how to adjust ignition timing with a timing light is a valuable skill. In this guide, we will...
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Why Relays Matter in Modern Vehicles — And Why ...
In today’s vehicles, electrical systems are no longer simple circuits. They are high-load, multi-module, computer-controlled networks.
Why Relays Matter in Modern Vehicles — And Why ...
In today’s vehicles, electrical systems are no longer simple circuits. They are high-load, multi-module, computer-controlled networks.
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A Mechanic’s Shop Diary: The 10-Minute Spark Te...
Most misfire stories start the same way: “It runs… but it doesn’t feel right.” No warning lights. No obvious codes. Maybe a little stumble at idle, a slight loss of...
A Mechanic’s Shop Diary: The 10-Minute Spark Te...
Most misfire stories start the same way: “It runs… but it doesn’t feel right.” No warning lights. No obvious codes. Maybe a little stumble at idle, a slight loss of...
