This handheld portable VI curve tester VI Curve has 4 test frequencies, can be used when connected to an oscilloscope, both analogs oscilloscopes and digital oscilloscopes can be used. Dual signal input, alternating display function allows you to use it in easier. 4-gear frequency, alternating speed adjustable, you can adjust it according to your needs. One click on channel/alternating display, which can give you a better using experience. When testing the circuit board online, do not recharge the circuit board. If there is a capacitor on the circuit board, discharge the capacitor first, otherwise it is easy to burn out the VI test board. type:VI Curve Tester Channel:2 channels Frequency:4 gears Colour:Black Material:plastic+Metal Package Contents: 1 * Tester 1 Pair * BNC Cable 1 Pair * Test Cable 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.