SEE

This is not a fancy VU meter, it has a linear response and is designed to measure voltages to help you understand
what’s going on with your control voltages. Each LED represents 1 volt (red for positive range and blue for negative range).

• Both jacks sockets are in parallel, so select one for the input signal and the other for the output signal.
• The unique button toggles between plain mode (default) or dot mode.