AUTOOL SPT301Product OverviewThe AUTOOL SPT301 car spark tester is designed to test spark plug performance and spark strength under simulated engine working conditions. It supports three-hole comparative testing, 200-9000 RPM adjustment, a digital RPM display, and a transparent safety cover for safer visual inspection of common crankshaft-engine and motorcycle spark plugs.Three-Hole Testing 200-9000 RPM Digital Display Safety CoverAC 110V / 220VInput Power3Test Holes9000 RPMMax Simulation3 YearsMain Unit Warranty Click to enlargeBefore You Order And UseBefore You Order And UseSPT301 is a high-frequency spark plug tester. Read the power, protective cover, high-voltage, and maintenance notes before inserting spark plugs or starting a test.Power Off Before Installing PlugsDo not insert or remove spark plugs while the power supply is connected. Turn off the tester before installing, removing, or repositioning spark plugs.Close The Safety CoverClose the transparent protective cover before testing. It helps reduce direct exposure to sparks during visual observation.Do Not Touch During OperationWhen the spark plug is running, the voltage can reach tens of thousands of volts. Do not touch the spark plug directly with bare hands.Use Correct Input PowerUse AC 110V / 220V ±10% input power as specified for the SPT301 spark plug tester.Use For Suitable Spark PlugsSPT301 is suitable for common 12V automotive spark plug testing and motorcycle spark plug checks. Confirm size and fitment before testing unusual plug types.Store In A Dry PlaceWhen not in use, store the tester in a dry, ventilated place. Avoid hot, humid, non-ventilated areas and contact with corrosive liquids.Maintenance ReminderRegularly check parts that need to be tightened or connected. Tighten loose parts before operation.Avoid rubbing the housing against rough surfaces to reduce wear.Do not overload the equipment, and make sure the safety guard remains complete and reliable.If wiring shows aging or damage, stop use and contact support before continuing.Key FeaturesKey FeaturesSPT301 combines three-hole comparison, adjustable simulated RPM, digital display control, long spark plug support, and a safety cover to make spark plug condition checks faster and easier to observe.Comparative TestingTest one standard or new spark plug together with two test spark plugs for a more straightforward visual comparison of spark strength and performance.200-9000 RPM SimulationSimulate spark plug operating status during engine function with adjustable RPM. A higher simulated frequency shows stronger spark intensity during testing.Three-Hole DesignThe three-hole layout supports simultaneous comparison of three spark plug positions, making it suitable for efficient 12V automotive spark plug checks.Adjustable Test Hole HeightThe adjustable test hole height helps support longer spark plug ends and improves compatibility for models that use longer plug structures.Digital RPM DisplayThe LCD digital backlit display clearly shows the simulated RPM, helping users control test conditions with better visibility.Transparent Safety CoverThe protective cover lets users observe spark behavior while reducing direct spark exposure during operation. Click to enlarge Click to enlarge Click to enlarge Click to enlarge Click to enlarge Click to enlarge Click to enlargeSpecificationsAUTOOL SPT301 Product SpecificationsSPT301 uses AC 110V / 220V input power, DC12V output, 200-9000 RPM simulated speed, and a compact 200 × 118 × 118mm body with a 500g product weight.Core SpecificationsProductAUTOOL SPT301 Car Spark Plug TesterWorking PrincipleDigital sensingInput PowerAC 110V / 220V ±10%Output PowerDC12V ±2 1ASimulated RPM200-9000 RPMAmbient Temperature0°C-45°CRelative Humidity<85%Product Dimensions200 × 118 × 118mmProduct Weight500gTesting And DisplayTest Hole Positions3Adjustable Hole Position HeightSupportedWorking Condition SimulationSupportedAdjustable Simulated RPMSupportedLCD Digital Backlit ScreenSupportedLong Spark Plug TestingSupportedSafety Protection CoverSupportedProduct StructureStandard Test HoleReference plug position for comparisonTest HolesTwo test plug positionsControlsRPM “ ”, RPM “-”, and power switchInterfaceDisplay screen and power port Click to enlarge Core SpecificationsInput PowerAC 110V / 220V ±10%Output PowerDC12V ±2 1ASimulated RPM200-9000 RPMAmbient Temperature0°C-45°CRelative Humidity<85%Dimensions200 × 118 × 118mmWeight500g Testing FeaturesTest Holes3Adjustable Hole HeightSupportedLCD Backlit ScreenSupportedLong Spark Plug SupportSupportedSafety CoverSupported How To UseHow To UseInstall the spark plugs, close the protective cover, connect power, adjust the simulated RPM, and observe the spark plug test status through the transparent cover.Place The Spark PlugsInsert the standard spark plug into the standard test hole, then insert the spark plugs to be tested into the test holes.Close The Protective CoverCover the protective cover before testing to reduce direct spark exposure and improve safety during observation.Connect Power And StartPlug the power adapter into the side power interface, connect the power supply, and turn on the power switch.Adjust RPM And ObserveUse the “ ” and “-” buttons to adjust the working frequency, then observe the spark plug test status through the protective cover.Use NotesTurn off the power before inserting, removing, or adjusting spark plugs.Do not touch the spark plug directly during operation.The higher the working frequency, the stronger the displayed spark plug intensity during testing.If the spark plug is unusually long or has an uncommon structure, confirm the fit before testing.Product ComparisonProduct ComparisonCompare SPT301 with SPT101, SPT105, and SPT360 before choosing the right hole count, RPM range, digital display, long spark plug support, and comparison capacity.SPT101Entry dual-hole model with 0-6000 RPM, safety cover, adjustable simulated RPM, and no LCD digital backlit screen or long spark plug support.SPT105Dual-hole model with 0-6000 RPM, adjustable hole position height, safety cover, adjustable simulated RPM, and long spark plug support.SPT301Three-hole model with 200-9000 RPM, adjustable hole position height, safety cover, LCD digital backlit screen, and long spark plug support.SPT360Five-hole model with 200-9000 RPM, LCD digital backlit screen, and higher comparison capacity for users who need more test positions.Decision CheckChoose by test hole count, RPM range, adjustable height, digital display, long spark plug compatibility, and workshop testing volume. Click to enlargeRelated ProductsRelated ProductsCompare related AUTOOL spark plug tester models before choosing the right test-hole count, RPM range, LCD display, adjustable hole height, and long spark plug compatibility.Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Spark Plug TesterAUTOOL SPT101 Spark Plug Tester Spark Plug CheckerRated 0 out of 5(0) From US$40.00 Select options This product has multiple variants. The options may be chosen on the product page Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Spark Plug TesterAUTOOL SPT105 Spark Plug Tester Tool Adjustable Spark TesterRated 0 out of 5(0) From US$33.00 Select options This product has multiple variants. The options may be chosen on the product page Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Spark Plug TesterAUTOOL SPT301 Car Spark Tester Automotive DiagnosticRated 0 out of 5(0) From US$59.00 Select options This product has multiple variants. The options may be chosen on the product page Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Spark Plug TesterAUTOOL SPT360 Spark Plug Tester Automotive DiagnosticRated 0 out of 5(0) From US$59.00 Select options This product has multiple variants. The options may be chosen on the product page Related GuidesRelated GuidesReview spark plug replacement signs, spark plug tester basics, and routine maintenance topics before choosing the right AUTOOL spark plug tester.August 6, 2024Spark Plug Tester-Everything You Need to KnowUnderstand what a spark plug tester does, how spark strength comparison works, and when this type of diagnostic tool is worth buying.February 26, 2025Why Are Spark Plugs Replaced in Sets of Four?Learn why grouped replacement matters and how consistent plug performance affects comparison testing and ignition troubleshooting.July 9, 2021When the car has any symptoms, it means that the spark plug should be replaced?Use common misfire and performance symptoms as a quick reference when deciding whether to verify plugs with a spark tester.October 23, 2024Car Maintenance Guide: Everything You Need To KnowReview routine maintenance context around ignition health, replacement timing, and workshop inspection habits before spark plug diagnosis.Manual And DownloadsManual And DownloadsDownload the SPT301 manual for safety cautions, product structure, specifications, operating instructions, maintenance guidance, warranty access, and return or exchange information. Click to enlargeAUTOOL SPT301 Manual PDFOpen the manual for SPT301 setup, warnings, operation, maintenance, and warranty details. Download ManualNeed Setup Confirmation?Contact AUTOOL Store if you need to confirm input power, spark plug fitment, SPT101 / SPT105 / SPT301 / SPT360 model selection, safety cover use, or package contents before ordering.Email[email protected] WhatsApp 86 189 2647 7404 Click to enlargeWhat Is In The BoxWhat Is In The BoxThe package image shows the SPT301 main unit, retail box, user manual, and power adapter. Spark plugs shown in function images are for testing demonstration and are not listed as included accessories.Main UnitAUTOOL SPT301 spark plug testerPower AdapterIncluded power adapter shown in the package imageDocumentationAUTOOL SPT301 user manualRetail BoxAUTOOL SPT301 packaging boxAccessoriesRefer to the official package image for final included accessoriesQuestions And AnswersThese answers cover spark plug compatibility, three-hole comparison, RPM adjustment, power input, safety cover use, model selection, package contents, and warranty support. What Spark Plugs Can SPT301 Test? SPT301 is designed for common 12V automotive spark plug testing and motorcycle spark plug checks. It supports long spark plug testing and adjustable test hole height, but users should confirm fitment before testing unusual plug sizes or special structures. How Many Spark Plugs Can It Test At The Same Time? SPT301 has three test positions. It can compare one standard or new spark plug with two spark plugs to be tested, helping users observe spark strength and performance differences more directly. Can The Simulated RPM Be Adjusted? Yes. Use the “ ” and “-” buttons to adjust the working frequency. SPT301 supports 200-9000 RPM simulation, and the digital display shows the simulated RPM during testing. What Power Supply Does SPT301 Use? SPT301 uses AC 110V / 220V ±10% input power and DC12V output. Use the included power adapter shown in the package image and confirm local power compatibility before use. Do I Need To Close The Protective Cover Before Testing? Yes. Close the protective cover before testing. The tester generates high-voltage sparks during operation, so do not touch the spark plug directly and do not insert or remove spark plugs while the power supply is connected. What Is The Difference Between SPT301 And SPT360? SPT301 has three test hole positions and supports 200-9000 RPM, LCD digital backlit display, adjustable hole position height, and long spark plug testing. SPT360 has five test hole positions for users who need more comparison capacity. What Is Included In The Package? The package image shows the SPT301 main unit, retail box, user manual, and power adapter. Refer to the official packing list image for the final package contents. Spark plugs shown in feature images are demonstration items and are not listed as included accessories. How Long Is The Warranty? AUTOOL provides a three-year warranty for the main unit, and included accessories are covered by a one-year warranty according to the manual. Warranty service applies to eligible non-human damage cases and depends on the actual breakdown situation.Warranty And ContactWarranty And ContactFor SPT301 setup, power input confirmation, spark plug compatibility, safety cover use, package contents, manual support, warranty service, or SPT101 / SPT105 / SPT301 / SPT360 model selection, contact AUTOOL Store directly.Pre-Sales And Product SupportUse support if you need help confirming whether SPT301 is the right three-hole spark plug tester for your vehicle, workshop workflow, input power environment, or comparison testing needs.SPT301 setup and safe-use confirmationAC 110V / 220V power input questionsCommon spark plug and long spark plug fitment supportSPT101 / SPT105 / SPT301 / SPT360 model selectionPacking list and accessory confirmationMain unit warranty and accessory warranty supportEmail Support[email protected] WhatsApp Support 86 189 2647 7404