4 test frequencies. (Can be used when connected to an oscilloscope, both analog and digital oscilloscopes) How to Use: Oscilloscope Parameter Settings: Adjust the oscilloscope to X-Y mode (different oscilloscopes have different adjustment methods, please explore on your own). Adjust the vertical parameters of both X and Y channels to 1V/. This is only necessary for a single-channel oscilloscope. Analog oscilloscopes do not require timebase adjustment; digital oscilloscopes adjust the timebase between 1-5ms. When properly connected, the oscilloscope display a horizontal line. If a vertical line is displayed, the XY connector is reversed. Adjust the vertical and horizontal parameters; the horizontal and vertical lines are located in the display box. Dimensions: 109.0 x 97.0 x 84.0mm Weight: 385.16g Color: Blue Material: Aluminum Alloy Package Contents: 1 * host 1 pair * test leads 1 pair * BNC cables 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.