Here is a used Trilithic Model Two cable signal level meter programmable for up 135 different channels with audio. This comes with theprotective slip case for meter. I don't have the adapter but there is a full battery I tested it and it works fine. if you look closelyyou can it is powered up. The screen has a few small scratches.I know these are very expensive, so this could be a great way to get a good meter for a lower price!