1. Visual monitoring of positive and negative signs. The positive and negative signs can be seen on the top test lamp, which can identify 2~30V voltage in a range and effectively solve the problem of low-voltage line monitoring. 2. Innovative separation design combined auxiliary needle chuck convenient combined clip and auxiliary needle, flexible application When using the auxiliary needle, the clip can be rotated and removed 3. Quickly identify and detect the red and green double-color signal lights with the main needle as the identification object, the red light is the positive pole; the green light is the negative pole (the main light can identify and monitor the voltage of 5V-30) 4. Multifunctional professional grade Sensitive, safe and durable, the multifunctional professional grade vehicle circuit detection pen is suitable for all kinds of vehicles, with it, the problem can be solved! Product Description: Product name: Multifunctional digital display electric pen for auto repair Features: Widely used in circuit detection of automobiles Measuring range: 5V-30V size: cable length 1.1m Material: plastic colour: black Package Contents: 1 x digital voltage tester 2 x probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.