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Handheld automotive test light with digital display and alligator clip

3-72V DC Automotive Test Light

SKU CH-Q49G-3RQYJ

A 3-72 V DC bidirectional circuit tester with LED digital display, polarity indication and computer-safe low current draw

  • FeaturesAutomotive Circuit Tester, Battery Powered, false
  • Weight0.25 kilograms
  • Sports Team1 Piece
  • TypeDigital Voltage Voltmeter
  • Tests 3-72V DC circuits for wide vehicle coverage
  • Digital display reads to .1V with ±0.2V accuracy
  • Bidirectional testing shows polarity via red or green LEDs
  • Low current design protects sensitive vehicle computers
  • Lightweight .25 kg build with auxiliary work LEDs

3-72V DC Automotive Test Light

The JASTIND 3-72V DC automotive test light is a bidirectional circuit tester designed for vehicle electrical diagnostics. It checks headlights, taillights, fuses and battery circuits across a wide voltage range. The tool suits professional technicians and DIY owners who need accurate polarity indication and a built-in illumination aid for low-light work. It is not for technicians who require AC voltage measurement or continuity testing functions beyond DC polarity detection.

Capacity and headroom

The tester covers a 3-72V DC range with a digital display resolution of .1V and accuracy within ±.2V. Dual-colour LEDs and a buzzer signal positive or negative polarity instantly when the clamp attaches to either ground or power. The low-current circuit board protects sensitive vehicle computers during probing. It runs out of range above 72V and cannot display readings below 3V, limiting use on very low-voltage signal wires.

How it fits into a build

The handheld unit weighs .25 kg and operates on battery power, requiring no external supply or vehicle battery connection for the display. Its integrated LED work lights illuminate the test point, freeing the user from holding a separate torch. The compact probe fits tight engine-bay spaces, while the alligator clip secures to standard battery terminals or chassis grounds. Buyers needing a mains-powered bench meter or data-logging capability should look elsewhere.

Highlights

  • Tests 3-72V DC circuits for wide vehicle coverage
  • Digital display reads to .1V with ±0.2V accuracy
  • Bidirectional testing shows polarity via red or green LEDs
  • Low current design protects sensitive vehicle computers
  • Lightweight .25 kg build with auxiliary work LEDs

Specifications

BrandJASTIND
FeaturesAutomotive Circuit Tester, Battery Powered, false
Weight0.25 kilograms
Sports Team1 Piece
TypeDigital Voltage Voltmeter

Questions about this item

Will this tester work on the 12 V system in my older car?

Yes, the 3-72 V range covers standard 12 V automotive circuits.

How can I confirm the unit is reading correctly after I connect it?

The LED display shows voltage to 0.1 V with ±0.2 V accuracy; red LED and one beep mean positive, green LED and two beeps mean negative.

Does the package include a battery or do I need to buy one separately?

The tester draws power from the circuit under test, so no separate battery is required.

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