After a long search, this appears to be the best choice. 2nd to this would be the newer 1476CM, but that seems to lack the 24 hr test. I also looked at Sadelco, but the only one that would fit the bill is the DisplayMax 800. That has 10-15 db less sensitivity according to the specs of each. Add to the fact they don't seem to want to talk to anyone buying a used instrument, stating they do not have the time, I would rather look elsewhere. I need it for OTA antenna work. CATV is far secondary, so QAM is not that important.
Sencore SLM 1456 SLM in very good condition, not 'beaten up', with case, software & software password.