FS apex light with ldm module

[smokinreefer]

Originally Posted by Slyguy00

I have an apex light with the dc8 for sale. Comes with leak detection module, vdm module, 2 temp probes a Ph probe, a broken salinity probe, and a break out box for ato. Asking 600$
Not willing to separate. Only willing to sell as a whole unit.

Hey,

What is a vdm module for?
Broken salinity probe? As in it is non functional? Or just cosmetically damaged?
And what's a break out box?

I'm not familiar with controllers but am considering trying.
Thanks!