The schumann signal device provides accurate frequency adjustment and precise waveform output. Its user friendly design and stable operation make it a great choice for professionals in the field of electronics and testing. Designed for various environments such as laboratories, schools, and studios, where signal generation and frequency adjustment are required. Perfect for electronic device testing, equipment calibration, and scientific experiments. Unlock possibilities with the schumann signal device and improve your work or projects. Material: pcb colour: Green Package Contents: 1 x Schumann Generator 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.