Diagnose Electrical Problems Without Guesswork!
Transform Your Auto Repair Work with the Professional 2-in-1 Circuit & Relay Tester
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3-36V Circuit Testing Range
12V/24V Relay Compatibility
4-Pin & 5-Pin Relay Support
Compact Professional Diagnostic Design
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Automotive Electrical Faults Can Be Difficult to Locate?
Basic test lights can only show limited information, leaving you unsure whether the issue is voltage, polarity, continuity, or a deeper circuit fault.
Our Solution:
Combines circuit testing functions including voltage testing, polarity identification, continuity verification, short circuit detection, leakage testing, and drive testing in one compact diagnostic tool.
Many relay problems are hard to confirm by sight alone, especially when dealing with sticking contacts, coil burnout, or abnormal engagement.
Our Solution:
Designed with dedicated relay diagnostic capability to help identify critical relay failures quickly and support more confident repair decisions.
Some tools only support limited relay types, which can slow down work when checking different automotive electrical components.
Our Solution:
Supports both 12V and 24V automotive relays and is compatible with 4-pin and 5-pin relay configurations for broader workshop use.
Garage and repair environments can be demanding, especially when tools need to perform consistently across changing temperatures.
Our Solution:
Built for professional workshop application and designed to operate effectively from -10 °C to 60 °C.
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Redefine Your Automotive Electrical Diagnostics
Experience faster, clearer, and more complete circuit and relay testing with a compact professional tool made for mechanics and hands-on vehicle owners.
Advanced 2-in-1 Testing Capability
One tool combines a high-precision circuit tester with a dedicated relay diagnostic function, helping reduce tool clutter while improving troubleshooting efficiency.
Comprehensive Circuit Diagnostics
Check voltage, polarity, continuity, short circuits, leakage, and drive test conditions with one practical device built for automotive electrical systems.
Dual Voltage Relay Support
Compatible with 12V and 24V relays, including 4-pin and 5-pin configurations, making it useful across a wide range of vehicle electrical components.
Precise Fault Identification
Helps detect relay issues such as contact sticking, coil burnout, and abnormal engagement, giving immediate feedback for safer and more accurate diagnostics.
Feature Comparison
| Features | Ours | Others |
|---|---|---|
| Testing Capability |  Combines circuit testing and relay fault detection in one compact tool. |
 Often requires separate tools for circuit checks and relay diagnosis. |
| Circuit Diagnostics | Supports voltage, polarity, continuity, short circuit, leakage, and drive testing. |
Usually limited to basic power or continuity checks only. |
| Relay Compatibility | Works with 12V/24V automotive relays and supports 4-pin and 5-pin configurations. |
May only support limited relay types or require extra adapters. |
| Fault Identification | Helps identify contact sticking, coil burnout, and abnormal relay engagement. |
Relay issues may still require guesswork or repeated manual testing. |
| Workshop Use | Operates from -10 °C to 60 °C for demanding garage and repair environments. |
Not always designed for consistent professional workshop conditions. |
Product Specifications
Voltage:
3-36V
Operating Temperature:
-10 °C to 60 °C
Relay Compatibility:
12V/24V, 4-pin and 5-pin relays
Test Functions:
Voltage, polarity, continuity, short circuit, leakage, and drive test
Here’s Why People Trust the Sakerplus® 2-in-1 Automotive Circuit & Relay Tester
It’s become a practical diagnostic tool for people who want clearer electrical testing without switching between multiple devices.
The relay testing function is what sold me. I had an intermittent electrical issue and this made it much easier to narrow down the problem instead of replacing parts blindly.
Marcus L.
Verified purchase
Compact, clear, and useful. I keep it in my tool drawer for quick checks on wiring, voltage, and relay behavior. It feels made for real garage work.
Derek H.
Verified purchase
I like that it supports both 4-pin and 5-pin relays. That makes it more useful than the simple tester I had before, especially when working on different vehicles.
Anna P.
Verified purchase
Frequently Asked Questions
A1: It can be used for automotive circuit diagnostics and relay fault detection, including voltage testing, polarity identification, continuity verification, short circuit detection, leakage testing, and drive testing.
A2: The tester supports a 3-36V operating range. It should be used strictly within this range for proper and safe operation.
A3: Yes. It supports 12V and 24V automotive relays and is compatible with both 4-pin and 5-pin relay configurations.
A4: It can help detect relay issues such as contact sticking, coil burnout, and abnormal engagement, making relay troubleshooting clearer and faster.
A5: Yes. It is designed for professional workshop application and operates effectively between -10°C and 60°C, making it suitable for mechanics and DIY automotive users.
People Love It - Here’s why this Circuit & Relay Tester is a Garage Essential
Customers Give Positive Reviews