No more guesswork
The tester automatically identifies pin layouts, so you don't have to manually trace connections or consult wiring diagrams.
- Free shipping
- 14-day easy returns
- Secure checkout
- Quality guaranteed
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Why customers love it
Diagnose relay health in seconds, not guesswork
This compact handheld tester automatically identifies pin layouts, measures activation and release timing, and checks switching consistency—so you can pinpoint faulty relays in any 12V–24V vehicle quickly.
- Automatically identifies pin layouts, eliminating guesswork
- Runs 10 automated open/close cycles to evaluate action and release timing
- Green LED confirms relay is functioning; red LED signals a fault or mismatch
- Compatible with 4-pin and 5-pin universal automotive relays
- Works with 11V–25V battery power—connects directly via alligator clips
Why you'll love it
Fast, clear results
Green LED confirms a functioning relay, while a red LED signals a fault or mismatch—instant pass/fail at a glance.
Thorough testing
Runs 10 automated open/close cycles to evaluate action and release timing, catching intermittent issues a simple check might miss.
Universal compatibility
Works with 4-pin and 5-pin universal automotive relays and connects directly to 11V–25V battery power via alligator clips.
Setup
How it works
No electrician, no wiring, no fuss.
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Connect power
Attach the alligator clips directly to a battery or power source within the 11V–25V range.
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Plug in the relay
Insert the relay into one of the three built-in test sockets for quick plug-and-test operation.
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Read the result
The tester runs 10 automated open/close cycles and shows the outcome via LED indicators—green for functioning, red for a fault or mismatch.
Specs
The details that matter
Built to last outdoors, season after season.
- Voltage
- 12V–24V (11V–25V)
- Compatibility
- 4-pin and 5-pin universal automotive relays
- Coil resistance
- 20 ohms or higher
- Test sockets
- 3 built-in
- LED indicators
- Green (functioning), red (fault or mismatch)
Comparison
Why choose this relay tester
Not all products in this category are built the same.
Feature
SmartPicksWorld
Typical alternative
Pin layout identification
Automatic detection, no guesswork
Manual pin identification required
Testing depth
10 automated open/close cycles to evaluate action and release timing
Simple continuity check only
Result clarity
Green/red LED indicators for clear pass/fail
Ambiguous readings that require interpretation
Our worry-free shopping promise
If your order arrives damaged, defective, or not as described, contact us within 14 days and we will make it right with a replacement or refund.
Frequently asked questions
Everything you might want to know before you order.
Which relays is this tester compatible with?
This tester is compatible with 4-pin and 5-pin universal automotive relays, covering the most common relay types found in vehicles.
What power source does the tester need?
The tester works with 11V–25V battery power and connects directly via alligator clips, so you can power it from the vehicle battery or any suitable 12V–24V source.
How do I know if a relay is functioning properly?
The green LED confirms the relay is functioning, while the red LED signals a fault or mismatch, giving you a clear pass/fail result at a glance.
How thorough is the testing process?
The tester runs 10 automated open/close cycles to evaluate action and release timing, helping you catch intermittent relay issues that a simple check might miss.
What coil resistance range is suitable?
The tester is suitable for use with relays that have a coil resistance of 20 ohms or higher, which covers most standard automotive relays.
Shipping & returns
Shipping
- Delivers to United States (based on your selected country/region).
- Estimated delivery: 3–15 business days after dispatch.
- Shipping cost: Free.
Returns
You can request a return within 14 days after delivery. Standard returns have a €4.00 EUR (approximately $4.66 USD) flat-rate return shipping fee, deducted from your refund. Return shipping is free for items that arrived damaged, defective, or incorrect. Items should be unused and in original packaging where possible. Contact us before sending anything back.