What does "AC frequency response : (60-1000)Hz" mean for multimeters?
It means that for AC signals with frequency below 60 Hz or above 1000 Hz, you can't expect this meter to give an accurate AC rms voltage reading.

This seems like a poor choice in case you someday want to use this meter on a 50 Hz AC system. But if you live in North America or the right parts of Japan, maybe you don't care about that.