The 2-in-1 Automotive Tester That Checks Circuits and Diagnoses Relays
Diagnose Electrical Problems Faster — Without Guesswork!
High-Precision Circuit Testing
Dedicated Relay Fault Detection
Supports 12V / 24V Automotive Relays
Compact Tool for Workshop & DIY Use
"A Garage Essential for Electrical Troubleshooting" — Built for Drivers, DIY Mechanics & Workshop Users
Drivers, DIY mechanics and workshop users give positive feedback
"I used to waste time swapping relays just to see what was wrong. This tester helped me identify a faulty relay quickly and kept the job simple."
"Compact, easy to use, and much more convenient than carrying separate tools for circuit checks and relay diagnostics."
Problem: Electrical faults can be hard to locate when you only have basic tools.
Solution: Combine circuit diagnostics and relay testing in one compact unit to check voltage, polarity, continuity, shorts, leakage, and drive functions more efficiently.
Problem: A bad relay can look fine from the outside but still cause vehicle systems to fail.
Solution: Relay diagnostics help detect contact sticking, coil burnout, and abnormal engagement before replacing parts.
Problem: Different vehicles may use different relay voltages and pin layouts.
Solution: Supports 12V and 24V automotive relays and works with both 4-pin and 5-pin relay configurations.
Problem: Workshop conditions demand tools that can handle repeated use.
Solution: Designed for professional and DIY automotive applications with an operating temperature range of -10°C to 60°C.
Combines circuit testing and relay fault detection in one convenient device, reducing the need to switch between multiple tools during troubleshooting.
Test voltage, identify polarity, verify continuity, and perform specialized checks such as short circuit detection, leakage testing, and drive testing.
Support for 12V and 24V automotive relays makes it suitable for a broad range of vehicle electrical components.
Quickly detect relay issues such as contact sticking, coil burnout, and abnormal engagement to help prevent electrical malfunctions.
| Feature | Ordinary Test Tools | Our 2-in-1 Automotive Tester |
|---|---|---|
| Testing Capability |  Usually limited to one basic function |
 Combines circuit testing and relay diagnostics |
| Circuit Diagnostics | Often only supports simple voltage checks |
Voltage, polarity, continuity, short circuit, leakage, drive test |
| Relay Support | May not support relay testing |
Compatible with 12V / 24V, 4-pin and 5-pin relays |
| Fault Identification | Requires more manual guessing |
Helps detect sticking contacts, coil burnout, abnormal engagement |
| Application | Less efficient for complex electrical troubleshooting |
Suitable for workshop use and DIY automotive repair |
3–36V operating voltage range
-10°C to 60°C for dependable workshop use
DW823 / DW833
Voltage, polarity, continuity, short circuit, leakage, drive test; compatible with 12V / 24V 4-pin and 5-pin relays
Here’s Why People Trust the 2-in-1 Automotive Circuit & Relay Tester
Built to make vehicle electrical diagnostics clearer, faster, and more practical.
"It gave me clear feedback while checking polarity and continuity. Great tool for anyone who works on automotive electrical systems."
"Reliable feedback, simple operation, and useful relay support. It has become one of my go-to tools for electrical checks."
"Instead of carrying separate tools for different checks, I can troubleshoot multiple electrical problems with one compact unit."
It is designed for automotive circuit testing and relay fault detection. It can help test voltage, polarity, continuity, short circuits, leakage, and drive functions.
Yes. It supports 12V and 24V automotive relays and is compatible with both 4-pin and 5-pin relay configurations.
It can help detect common relay issues such as contact sticking, coil burnout, and abnormal engagement.
The operating voltage range is 3–36V. Please use it strictly within this range for proper operation.
