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Trusted By 5+ Million DIYers & Mechanics
Find Innova at more than 30,000 stores nationwide
No Circuit is Out of Reach
Spark-proof protection and built-in safeguards ensure you can test and power components without risk.
Apply Power with Precision
Deliver 3V, 5V, and 12/24V directly to components for accurate, controlled testing.
Deliver 3V, 5V, and 12/24V directly to components for accurate, controlled testing.
Safe Power & Grounding with Built-in Circuit Breaker
Confidently power or ground components with integrated spark-proof
design
and positive/negative LED indicators.
10 MΩ input impedance and internal circuit breaker protect you and your vehicle from shorts or
overloads.
Confidently power or ground components with integrated spark-proof design and
positive/negative LED indicators.
10 MΩ input impedance and internal circuit breaker protect you and your vehicle from shorts or
overloads.
Perform Electrical Diagnostics Like a Pro
Power on fans, lights, relays, and more to verify function without needing the vehicle to be fully powered.
Power on fans, lights, relays, and more to verify function without needing the vehicle to be fully powered.
Component Testing
Watch for the component’s response when powered to pinpoint failures instantly. Narrow down the failure source by isolating and activating specific circuits.
Watch for the component’s response when powered to pinpoint failures instantly. Narrow down the failure source by isolating and activating specific circuits.
Versatile 45° Swivel Head
Found a hard-to-reach spot? Turn the head 45° and reach those areas with ease. Our patented design makes maneuvering around easy.
Found a hard-to-reach spot? Turn the head 45° and reach those areas with ease. Our patented design makes maneuvering around easy.
Power That Delivers Results
Designed for speed and accuracy
2 Bright LEDs
Illuminate your work space with the 2 bright LEDs that come installed with the tool.
LED Indicators
Easily know whether the ground is positive or negative with our LED light indicators.
Backlit LCD Display
View electrical readings even in dark environments with our built-in LCD display.
Unmatched Support
Get started easily with our manuals, video tutorials, and forums. Learn quickly and tackle diagnostics like an expert.
Built for Multiple Purposes
Do more than what you thought was possible
Scenario: The headlights, taillights, or a power window suddenly stop
working.
How the 5420 Helps Quickly test the fuse box or trace wiring to find out whether the circuit has power, ground, or a break—without needing to pull every fuse.
How the 5420 Helps Quickly test the fuse box or trace wiring to find out whether the circuit has power, ground, or a break—without needing to pull every fuse.
Full Feature Comparison
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| Innova 5420 | Other Brands | |
| Voltage Output | 3V, 5V-12/24V | 12-24V |
| DC Voltmeter | 0.1-200 VDC | Varies |
| AC Voltmeter | 0.1-200 VAC | Varies |
| Input Impedance | 10 MegOhm | - |
| Cord Length | 20 FT Total | Short |
| Swivel Head | 45° (patented) | - |
| Battery Clamps Alligator Clips | Yes | Yes |
| 4 inch Test probe | Yes | - |
| 2 inch Test probe | Yes | Yes |
| 6 FT Female to Male Cigarette plug | Yes | - |
| All-in-One Display | Shows 20+ Info | - |
| Backlit LCD | Yes | Varies |
| Circuit Breaker Reset | Automatic | Manual |
No.1 Automotive Diagnostic Tool Brand
Frequently Asked Questions
The 5420 can safely supply 3V, 5V, and 12/24V directly to circuits and components, giving you the
flexibility to test a wide range of electrical systems accurately.
Yes. The Innova 5420 features spark-proof protection, a 10MΩ input impedance, and a built-in circuit
breaker, making it safe for use on modern vehicles with sensitive electronics.
Absolutely. You can power up relays, lights, fans, and other components to see if they’re functioning
properly, helping you isolate faults quickly.
The tester includes a 20-foot heavy-duty cable, allowing you to work from bumper to bumper without
moving your power source.
You can perform a wide variety of tests including fuse tests, circuit tests, relay checks, battery
voltage checks, ground integrity tests, and component activation—all with one tool.