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Function: It can test the polarity of voltage, the continuity of relays and diodes, fuses and circuits, check lights, check motors, track and locate short circuits, poor grounding, test the polarity of cables and sockets and measure 6V at a DC voltage of 24V, etc. Includes: 1 x power scan, 1 x probe tip, 1 x battery connection clips, 1 x instruction manual (English language not guaranteed), 2 x clips. Cable length: approx. 4 m/157.Sinch, so you can measure the polarity of the different orientation circles of the vehicle. Application: 1. Attach the red clip to the positive pole of the car battery; 2. Attach the black clip to the negative pole of the car battery; 3. Connect the car's power probe to the wrong point of 6-24V DC. You can lead positive and negative battery currents to the probe by shaking the power switch forward or back. The cable length is approx. 4 m Features: This tool has two obvious reminders, sound and flash, so you can always use it in low light conditions. Sound: Beep There are surgery videos below, which can be viewed in detail. The device has short circuit protection, if the current exceeds 7A, the device automatically switches off the power. Reminder: Do not use this item near explosive gases, steam or dust. When you press the power switch (Note: or you shake), the battery current is directed directly to the tip of the pen, which can cause sparks when touching the ground or certain circuits. Do not use the device under 11/220V internal current, only for DC6~24V system.