The product does not work properly: it is not possible to set the arrow of channel 1 (black) to 0, and when a signal of 0 db is applied to both channels at the same time, the arrow of 2 (red) does not match the value on the screen. Which means that the device is not working properly.
The product arrived relatively quickly, but I had to pay custom duties more than half of the value of the product + shipping. The product required a recalibration because the measurement was incorrect. I do not know if the product was calibrated correctly or not in the production process or the adjustments suffered during transport