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Innova

Innova 5420 Power Circuit Tester for Automotive | 45° Swivel Head | Fuse, Relay, Battery, and Circuit Diagnostics | Voltage Tester, Multimeter, Relay Tester, Short Circuit Finder, 12V/24V

  • Based on 57 reviews
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Availability: Only 5 left in stock, order soon!
Fulfilled by The Factory Depot
Arrives May 14 – May 16
Order within 23 hours and 51 minutes
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Features

  • Power Up Diagnostics with Confidence Apply 3V, 5V, 12V, or 24V to activate components & test fuses, relays, circuits, and more. Identify faults fast with this pro-grade voltage tester.
  • Multifunction Testing in One Tool Combine fuse tester, relay tester, continuity checker & power supply probe in one compact device built for mechanics & automotive electricians.
  • Patented 45 Swivel Head for Easy Access The 5420s angled swivel probe pivots 45 degrees to reach tight spots and awkward connectors you couldnt with a straight probe; ideal for under dashboards, inside fuse boxes, and cramped engine bays.
  • Instant Results, Bright Display Large 1.25" backlit LCD and LED polarity indicators clearly show voltage, continuity, or shortseven in low light. Spark plug & circuit machine ready.
  • No Guesswork, Just Clarity Trigger components directly & see if they respond, so you pinpoint faulty relays or switches without removing them. Save time and second guesses.
  • Rugged Safety Features Built In Integrated 10 MegOhm circuit breaker prevents overloads. DC capable, compatible with all common car diagnostic tool needs.
  • Built for Heavy-Duty Use Durable 20ft cable handles garage abuse, while 10 MegOhm input impedance ensures safe testing on sensitive circuits. Perfect for automotive tools kits.

Brand: Innova


Power Source: Battery Powered


Color: Green,Red


Item Weight: 1 Pounds


Min. Operating Voltage: 3 Volts


Power Source: Battery Powered


Minimum Operating Voltage: 3 Volts


Measurement Type: Multimeter, Voltmeter


Color: Green,Red


Item Weight: 1 Pounds


Package Weight: 0.61 Kilograms


Unit Count: 1 Count


Specification Met: CE, RoHS, UL


Brand Name: Innova


Bullet Point: Built for Heavy-Duty Use – Durable 20ft cable handles garage abuse, while 10 MegOhm input impedance ensures safe testing on sensitive circuits. Perfect for automotive tools kits., Instant Results, Bright Display – Large 1.25" backlit LCD and LED polarity indicators clearly show voltage, continuity, or shorts—even in low light. Spark plug & circuit machine ready., Multifunction Testing in One Tool – Combine fuse tester, relay tester, continuity checker & power supply probe in one compact device built for mechanics & automotive electricians., No Guesswork, Just Clarity – Trigger components directly & see if they respond, so you pinpoint faulty relays or switches without removing them. Save time and second guesses., Patented 45° Swivel Head for Easy Access – The 5420’s angled swivel probe pivots 45 degrees to reach tight spots and awkward connectors you couldn’t with a straight probe; ideal for under dashboards, inside fuse boxes, and cramped engine bays., Power Up Diagnostics with Confidence – Apply 3V, 5V, 12V, or 24V to activate components & test fuses, relays, circuits, and more. Identify faults fast with this pro-grade voltage tester., Rugged Safety Features Built In – Integrated 10 MegOhm circuit breaker prevents overloads. DC capable, compatible with all common car diagnostic tool needs.


Title: Innova 5420 Power Circuit Tester for Automotive | 45° Swivel Head | Fuse, Relay, Battery, and Circuit Diagnostics | Voltage Tester, Multimeter, Relay Tester, Short Circuit Finder, 12V/24V


List Price: 149.99


Model: 5420


UPC: 042173154203


Manufacturer: Innova Electronics


Part Number: 5420


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: May 14 – May 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Tester
Great for the price!!!.
Reviewed in the United States on February 28, 2026 by Amazon Customer
    • Fantastic diagnostic tool
Fantastic tool that I should have bought years ago. I got it on sale for well below the price of the other big brand names, and it's lived up to my expectations plus some. The pivot head makes it a lot easier to use under the dash and the voltage switch makes testing for wiring connectivity much easier. Highly recommend for any technician who does vehicle electrical repairs regularly ... show more
Reviewed in the United States on October 5, 2025 by Genevieve Weiss
    • Great Circuit Tester Tool.
Great circuit tester tool for automotive applications.
Reviewed in the United States on August 22, 2025 by Nate
    • Love it!
I never knew I've been missing such an important tool. For the longest time I've dismissed these power probes as nothing more than a gimmick not fully realizing how they work. Prior to this using multimeter was my go to, but this tool makes things so much easier and quicker to diagnose that it's a whole new category in itself. I bought this version because it has 3/5/12V options to send power, while others only did the 12V. To me that seemed important because many sensors/solenoids, run on lower voltage than 12V and you wouldn't want to fry them, or get misleading results from sending the wrong voltage to those parts. If you are on the fence about getting a power probe and you do automotive work quite often, I'd say get it, you'll thank yourself that you did. ... show more
Reviewed in the United States on July 13, 2023 by Tech Expert
    • easier to get into smaller places
Better than I expected. The smaller size and pivot head really made a difference for testing circuits.
Reviewed in the United States on January 26, 2023 by james
    • Updated: Good way to combine a meter, test probe, and apply power (needs inline fuse)
The Innova 5420 powered tester is made in Taiwan. I used this tool to find a bad ground, to find a wear spot on a trailer light that was blowing fuses, and to test and replace bad wiring/lights on another trailer with brakes. The ability to power devices from the tester is a big plus to help find if the wiring or the device is the problem. This made quick work diagnosing two trailers with LED lights. The voltage readout is also handy. This one tool does a better job of handling the same situations where I would need two or three different diagnostic tools/meters. For the money, I expected to have a good case (not included). I recommend this tester. Formerly 5 stars Update: This tester does not have any current limiting device (fuse or circuit breaker) in the power cord. That is an issue if you ground out something that is sensitive like a 5V sensor. So....I added an inline fuse to my setup. For the money, Innova should have something factory to handle this, and not for me to add on. I'm taking off one star, but if I damage anything, I'll be back to deduct another star. 4 stars (for now) ... show more
Reviewed in the United States on November 14, 2022 by Joe and Jane User
    • Aight
Is good overall, i wish it had a case or bag. You have to connect it to battery in order to work.
Reviewed in the United States on August 29, 2025 by alko
    • Best value for the price.
I like that it bends. Easy to use
Reviewed in the United States on January 7, 2023 by Haley Strader

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