Two-in-one automotive circuit relay diagnostic instrument, capable of detecting 4PIN and 5PIN relays, with a digital display screen for voltage reading. Equipped with an extended cable and battery clamp, the probe can detect circuit continuity and identify positive and negative poles. Suitable for fuel vehicle maintenance. The casing is resistant to bumps. It is only for fault auxiliary diagnosis. Maintenance must follow automotive repair safety regulations.

The device is equipped with a digital display screen, allowing for intuitive reading of voltage values, facilitating maintenance personnel to quickly obtain circuit data. The entire machine is paired with an extended connection cable, which can be directly connected to the vehicle battery to draw power. The long cable design enables convenient detection at different positions on the vehicle, without being restricted by space and location. The probe probe is securely connected, facilitating contact with narrow and concealed wiring connector joints, detecting the continuity of vehicle circuits, positive and negative pole identification, and locating common problems such as circuit short circuits and open circuits.This dual-purpose automotive circuit tester integrates relay testing and circuit continuity detection functions. It is specifically designed for automotive repair scenarios, assisting auto mechanics in troubleshooting vehicle wiring faults and detecting the working status of relays. It is suitable for repair shops, roadside auto repair outlets, and individual vehicle maintenance.


The instrument supports 4PIN and 5PIN relay testing. Without disassembling the relay, it can directly connect to complete basic performance judgments, assisting in detecting whether there are abnormal suction or contact failures in relays, reducing the need for blind component replacement and lowering maintenance costs. The body is equipped with physical function buttons, with simple operation logic. Refer to the body markings to complete relay testing and circuit detection switching.

The casing is made of hard engineering plastic, resistant to bumps, suitable for the working environment of repair workshops. The wiring arrangement of the entire set of equipment is regular, and the cable has good tensile performance. It is not easily damaged after repeated bending during daily use.

It is mainly used for measuring vehicle circuit voltages, conducting continuity tests, identifying positive and negative poles, and screening the functions of various 4-pin and 5-pin automotive relays. It is suitable for the maintenance of most fuel vehicles such as sedans and SUVs. When using, it is necessary to follow the automotive repair safety operation specifications. Before testing, confirm that the clamps are firmly held to avoid reverse positive and negative pole connections; the instrument is only an auxiliary diagnostic tool, and the final determination of faults requires a comprehensive judgment based on the experience of the maintenance personnel. Do not exceed the measurement range to avoid equipment damage. This dual-purpose tester combines circuit probe testing and relay testing into one, reducing the need to switch between multiple tools and improving the efficiency of automotive repair and maintenance.